All posts by yni957

What Hillbilly Elegy reveals about J.D. Vance

If J.D. Vance were not a candidate for the US vice presidency in this election cycle, I would never have read his famed memoir by now.  Memoirs are not among my favorite genres, and reading one written by a 30-year-old Yale Law alumnus turned venture capitalist seemed like a waste of time.   Don’t get me wrong—I have no doubt that someone with Vance’s résumé is smart, ambitious, and hard-working, and their life may even be interesting.  However, stories of such prodigies are abundant in this country, thanks to popular culture’s obsession with them. While these successes are well-deserved and respectable, they hardly inspire any curiosity or excitement in me.

Now that Vance is on the ticket for the highest office in the land, paired with the most controversial and divisive politician in generations, his memoir suddenly becomes a window into his inner world—his beliefs, values, and preferences that could profoundly shape the future of this country.    My interest was also piqued because Vance was known for his anti-Trump stances—he famously compared his current running mate to Hitler. Would his book reveal any clues about his 180-degree turn on Trump? Was his change of heart simply political expediency or the result of some sort of epiphany? In any case, I felt this was a book I needed to read, even if I did not want to.

Given my relatively low expectations, Vance’s book was a surprisingly smooth and thought-provoking read.  As a competent writer, he knows how to command the attention of the reader through storytelling.  I was never bored, partly because the lives of hillbillies—white working-class people from rural, mountainous regions of the United States—feel so alien to me. Of course, I’ve heard about the “white working-class,” but never before had I been brought so close to the vivid details of their day-to-day lives.

Vance’s maternal grandparents were from Appalachian Kentucky, which they left for the Midwest at a young age. Vance speculates that his grandmother’s unexpected teenage pregnancy may have hastened their departure. However, they were largely part of a broader wave of Appalachian people migrating to America’s industrial heartland in search of better opportunities.   The young couple settled in Middletown, Ohio, where Vance’s grandfather secured a blue-collar job in the steel industry, which, in those good old days, paid well enough to support a middle-class family.

Vance’s mom was a good student in high school—even the salutatorian, according to the book. However, her life was derailed after she became a single teenage mother.  Following her first unsuccessful marriage, she married a few other men and dated many more, but gave birth to only one more child, the lucky J.D.  The central plot of the book revolves around how young Vance grew up with a mother who led a tragically chaotic life and was rarely able to provide him with anything resembling a normal home.   He never had a stable father figure—the introduction of a new father to the home always brought an escalating series of dramas that ended with the disintegration of the family.  Mostly, the destructive force seemed to come from Mom—at least that’s the impression one gets from reading the book. Here is how Vance described one of the episodes unfolding after Mom moved in with Matt, one of her boyfriends (or husbands, it’s not entirely clear).

Living with Mom and Matt was like having a front-row seat to the end of the world. The fighting was relatively normal by my standards (and Mom’s), but I’m sure poor Matt kept asking himself how and when he’d hopped the express train to crazy town. It was just the three of us in that house, and it was clear to all that it wouldn’t work out. It was only a matter of time.

Vance was deeply troubled by his mother’s “revolving door of father figures”—it must have felt like a disgrace that tainted the honor of the extended family.  He recalled being set off by a Facebook post from a 13-year-old girl pleading with her mother to stop changing boyfriends. Sympathizing with the young girl, Vance lamented,

for seven long years, I just wanted it to stop. I didn’t care so much about the fighting, the screaming, or even the drugs. I just wanted a home, and I wanted to stay there, and I wanted these goddamned strangers to stay the fuck out.

It wasn’t just boyfriends and drugs. Mom once threatened to kill him by crashing the car they were riding in, forcing Vance to flee while she pursued him in a rage. The ordeal ended only when the police came to take her into custody. I paused for a long time after reading about this horrifying event, trying to imagine how I would have coped as an 11-year-old boy in that situation—I’m not sure I would ever fully recover from such trauma.

After the incident, Vance struck a deal with Mom: he lied to the judge to keep her out of jail, and she agreed to let him decide where he wanted to live. In the ensuing years, Vance would live briefly with his biological father, then with his half-sister Lindsay on and off (while his mother was either in treatment centers or otherwise unable to care for them), and finally with his grandma—the Mamaw—after the freshman year in high school.

The constantly shifting family structure and endless domestic violence Vance endured in his youth must have left an indelible mark on his psyche.  Even as an adult, he regularly has nightmares in which Mom is the monster chasing him in a treehouse.   He writes that he “used words as weapons”, because he had to survive in a world where “disagreements were war”.    He had to fight hard to control the “demons” within him, feeling they were “as much an inheritance as his blue eyes and brown hair.”

Sociologists have shown that children experiencing such family instability often face severe developmental challenges.   According to Vance, he would have succumbed to them had it not been for Mamaw and his sister Lindsay, who provided him with a semblance of stability and much-needed emotional and material support when he needed them most.  Mamaw was his savior, protector and hero. Without her, Vance would probably never have made it out of Middletown, let alone earned a J.D. from Yale and become a disciple of Peter Thiel.  Looking back at his high school years, Vance wrote,

Those three years with Mamaw—uninterrupted and alone—saved me. I didn’t notice the causality of the change, how living with her turned my life around. I didn’t notice that my grades began to improve immediately after I moved in.

Yes, the book is about a poor kid achieving the American dream despite the odds stacked against him.  The young author can be forgiven for wanting to brag about it—his achievements do seem like a small miracle when you realize how close he was to complete ruin. However, the book is also about more than that.

Vance tries to generalize his lived experiences—his struggles as well as his triumphs—to those of his neighbors in Middletown, of hillbillies, and more broadly, of the white working class. He notes that many families in these groups faced similar problems. In fact, his grandparents had their fair share of domestic violence and alcoholism.  To help understand the nature of the violence, it is worth noting that Mamaw once tried to kill her husband by literally setting him on fire after he broke his promise to never get drunk again.

Vance describes his communities as a world of “truly irrational behavior.”  Wherever he looked, he saw only desolation, indolence, and cynicism. But who or what is responsible for the predicament of his people?

It appears that Vance has been pondering this question since his teenage years. While the book is, to some extent, an effort to seek answers, it is by no means a formal and comprehensive analysis. Instead, his thoughts are scattered throughout the book, often presented as spontaneous rants inspired by some random anecdotes. His opinions are nuanced—remarkably so for a writer in his thirties.

To Vance, the hillbilly elegy is, above all, an economic story. In the booming postwar era, vibrant communities sprang up around manufacturing centers in what is now America’s infamous Rust Belt. Yet, these communities, heavily reliant on specific well-compensated blue-collar jobs, were inherently fragile and vulnerable to disruption. When those jobs were lost to globalization and technological advancements, workers and their families faced drastic lifestyle adjustments. Those unable to adjust—often people without advanced degrees or resources—became the “truly disadvantaged.” They found themselves trapped in communities where meaningful social support is scarce. These people were Vance’s family, neighbors, classmates, and friends.

As economically disadvantaged as the hillbillies might be, Vance argues that their conditions are further worsened by several cultural and psychological traits.

The first of these traits is the belief that one’s choices and efforts don’t matter. According to Vance, hillbillies often assume those who “make it” are either naturally gifted or born into wealth and influence. In this view, hard work is not nearly as important. Vance, once influenced by this mindset himself, vehemently rejects it. Before joining the Navy, he doubted whether he had what it took to succeed, even as Mamaw insisted he was destined for something great. Only after enduring Marine Corps boot camp and excelling as a military journalist did he realize that he had been consistently “underselling” himself, mistaking a lack of effort for inability.

Vance urges hillbillies to take personal responsibility for their failures and to stop making excuses. A case in point is Mom. Although Vance acknowledges that genetics and upbringing may have contributed to her substance abuse and erratic behavior, he also believes she bears much of the responsibility. No one, he argues, should be granted “a perpetual moral get-out-of-jail-free card.”

Hillbillies share a deep-seated skepticism toward institutions: news media and politicians are seen as incessant liars, and universities, especially elite ones, are believed to be rigged against their children. This distrust reinforces a sense of helplessness and discourages engagement with society. The logic seems clear: if the path forward is blocked by liars and grifters, why try at all?  To his credit, Vance holds modern conservatism accountable for failing its “biggest constituent.” He writes, “Instead of encouraging engagement, conservatives increasingly foment the kind of detachment that has sapped the ambition of so many of my peers.” According to Vance, it’s the message of the right—that “it’s your government’s fault you’re a loser”—that has planted seeds of cynicism and despair in these communities.

Hillbilly families also have a massive parenting problem. Teachers feel powerless to help their students succeed in school because, as one teacher allegedly told Vance, these kids are “raised by wolves” at home. The cause of poor parenting, it seems, has more to do with culture than economics.  Even for those who do live in poverty, their basic material needs—food, clothing, shelter, transportation, and school supplies—are rarely at risk.  Mom always made sure Vance and Lindsay had the “trendiest Christmas gifts,” even if it meant spending money she didn’t have.  And Mom seems not alone in her desire to indulge her children’s craving for extravagant gifts. What seems lacking is a fundamental appreciation for raising kids to become educated, responsible individuals. Their actions ultimately harm the children, but they don’t care enough to change course.  As Vance observed,

We don’t study as children, and we don’t make our kids study when we’re parents. Our kids perform poorly in school. We might get angry with them, but we never give them the tools to succeed.

Are there solutions to the problems in these communities? Vance didn’t think so, especially not in the form “a magical public policy or an innovative government program.”  Public policy can help, he writes, “but there is no government that can fix these problems for us.”  In fact, Vance frequently points out—like a true conservative—how government intervention can make bad problems worse. His greatest frustration appears to be with welfare.   He describes, often with exasperation, instances like a neighbor who has never worked a day in her life but unabashedly complains about other welfare recipients abusing the system; or a jobless, drug-addicted acquaintance who often buys T-bone steaks at a grocer, which Vance could not afford while working part-time at the same grocer.

To Vance, the welfare system not only rewards and perpetuates indolence but also creates resentment among those who work hard to earn an honest living. He argues that welfare is one of the main reasons “Appalachia and the South went from staunchly Democratic to staunchly Republican in less than a generation.” His objections feel passionate and authentic, though a bit ironic, given that both he and Mamaw were once welfare recipients themselves.

Vance urged hillbillies to stop “blaming Obama or Bush or faceless companies” and to start asking themselves what they can do to make things better. But how? Vance admitted he didn’t have answers. However, he did suggest that his people might look to coastal elites—the new friends he made at Yale and in Silicon Valley—as potential role models, because

their children are happier and healthier, their divorce rates lower, their church attendance higher, their lives longer. These people are beating us at our own damned game.

If memory serves me well, the book never mentions Trump by name, so we don’t actually know what Vance thought of him back then.   That said, Vance the VP candidate is no longer the young Silicon Valley investor who wrote Hillbilly Elegy nearly a decade ago.  He has now enthusiastically embraced much of the MAGA agenda. He converted to Catholicism not long ago, reviving his once abandoned career as a devout Chrisitan.  He speaks fondly of government-imposed tariffs as if it is a panacea to the economic plight of the American working class. On social issues, he remains staunchly conservative—pro-life, pro-family, pious and patriotic.  I am sure many progressives find Vance unbearably repulsive: the sleazy, heartless spin of January 6, the adamant opposition to abortion rights, the sexist slur of “childless cat lady”, and the list goes on.   However, if you read Hillbilly Elegy, you can at least understand the origins of his politics and behaviors:  he was trained, as a child, to weaponize words to win petty battles, he longed for families where kids enjoy safety and stability, and he hated women who mistreat their children.

By now, I’ve listened to many of Vance’s interviews, with both friendly and hostile hosts. It’s clear to me that he possesses a talent rare even among politicians: the power of persuasion. His performance at the Vice-Presidential Debate was nothing short of a political masterpiece, a testament to his extraordinary abilities. He was attentive, respectful, articulate, and persuasive, yet he also conveyed a strong sense of fortitude and conviction. His countenance and tone remained steady throughout, projecting a stoic image remarkably mature for his age—I think that is a gift from his troubled upbringing.

Whatever happens next week, I have my fingers crossed that this man may use his political genius for the good of the American people.

Marco Nie, 11/2/2024

Yang won best paper award

I just returned from the INFORMS Annual Conference, where I ran into several former students who are now professors across the globe—one from Europe, two from Asia, and one from the U.S.  One of them,  Yang Liu from National University of Singapore, won one of the 2023 best Transportation Science Paper Awards.  It felt surprisingly fulfilling to witness your students achieve accomplishments beyond your own.

The picture was taken with the Editor in Chief of Transportation Science, my colleague Karen Smilowitz (left), and Yang (middle)

A brief history of travel forecasting

David Boyce and Huw Williams are both esteemed transportation scholars, each with their distinct areas of expertise. With their long and distinguished careers closely intertwined with the development of travel forecasting as an intellectual discipline, it is only fitting that they have chosen to write a book about its past, present and future.

I know Professor Boyce well. My master’s advisor, Professor Der-Horng Lee at the National University of Singapore, studied under Boyce while pursuing his Ph.D. at the University of Illinois at Chicago. Lee’s own master’s advisor, Huey-Kuo Chen from Taiwan’s Central University, was also one of Boyce’s doctoral students during his tenure at the University of Illinois at Urbana-Champaign. This means I am either Boyce’s academic grandchild, or great grandchild, depending on how you count. Thanks to Lee I was well aware of this academic lineage even before I came to the U.S. in the early 2000s. When I joined Northwestern University as an Assistant Professor in 2006, Boyce was serving his alma mater by teaching transportation system courses as an adjunct professor. It took me a while to process the surreal news that I would now be a colleague of my academic forebear.

During my first meeting with Boyce in Evanston, IL, I learned about his joint book project with Williams, which had already been in progress for several years. The book was an ambitious and intriguing endeavor aimed at reflecting on the achievements, missteps, and challenges in our field. It was finally published in 2015, nearly 12 years after they began the project. Shortly afterward, I was asked to oversee the translation of the book into Chinese, a project that would take another five years. Through this process, I had to read the book cover to cover — and between the lines — several times, ensuring I understood every word and phrase. It was a time-consuming and occasionally frustrating task, to be sure, but a rewarding learning experience nonetheless. Ultimately, it is this rare opportunity that inspired me to share in this essay what I learned from the book and the insights it brought to light.

You may find a preprint of the paper at ssrn. Also check the following podcast automatically generated by Notebook LM  based on a PDF of the paper I fed to it.

From a Culture of Growth to the Needham Question

I was attracted to A Culture of Growth because I heard the book provides answers to the Needham question (李约瑟难题), namely why China, despite its early and significant achievements in technology, fell so far behind the West during the critical developmental phases of modern science.  Until I opened the book, I didn’t realize it was written by a Northwestern economist, Joel Mokyr, whom a friend in the economics department described as a leading authority on economic history.

Although Mokyr addresses the Needham question extensively in the final chapter, the book is neither motivated by nor primarily focused on that question.  Quite the contrary—if you read the book closely, you can’t miss Mokyr’s dismissal of the question itself. To him, what begs the question isn’t why China—or any other civilization, for that matter—failed to invent modern science, but rather why Europe succeeded. The book is devoted to providing an explanation.

Mokyr’s theory builds on Cardwell’s Law, which states that technological innovation tends to slow down or stagnate once an organization, economy, or civilization reaches a peak accomplishment. The stagnation occurs because the beneficiaries of the status quo become complacent and resist major creative disruptions that could threaten their dominance. Crucially, they often have the power to “suppress further challenges to entrenched knowledge” by either incentivizing would-be challengers to do their biddings or persecuting them as heretics.

How did Europe manage to break the spell of Cardwell’s Law? Mokyr attributed this success to Europe’s “fortunate condition that combined political fragmentation with cultural unity.” This unique environment gave rise to what he called a “Republic of Letters,” a loosely connected federation where intellectuals could freely exchange, contest, refine, and publish ideas across the borders of competing polities. This republic, along with the “market of ideas” it nurtured, rose gradually after the Middle Ages.

Europeans, following Bacon, began to recognize that knowledge could and should be harnessed for society’s material benefit, and that its creation, dissemination, and utilization should be a collective effort.  That is not to say the Republic of Letters was brought about by any concerted effort. Often motivated by the pursuit of lucrative patronage positions, the founding members of the republic sought to build strong reputations among their peers. This motive, in turn, pushed them to support free access to knowledge and uphold the right to challenge any idea, regardless of its origin.

The republic had no inherent hierarchy, except for the one that naturally emerged through fierce but largely free competition for peer recognition, based on a shared understanding of what constitutes merit.   Scholars who rose to the top of the pecking order often did fabulously well for themselves, attracting a “disproportionate amount of fame and patronage.”   They also became recruitment tools for the Republic of Letters and role models for future generations.  Newton was one such superstar whose influence as a model scientist is hard to overstate.  Mokyr wrote of Newton,

he was knighted, elected to Parliament, and became quite wealthy. In 1727 he was given a splendid funeral and interned in a prominent place in Westminster Abbey. Voltaire remarked that he was buried like a well-loved king.

Once the market of ideas took shape, it was sustained by Europe’s favorable geopolitical conditions.   On the one hand, political fragmentation meant that neither scholars nor their patrons could easily monopolize the market of ideas by blocking the entry of potential competitors or buying them off. Incumbents quickly realized that such maneuvers only pushed innovation into the hands of their rivals, ultimately undermining their own competitive advantage.   On the other hand, cultural unity allowed knowledge production and dissemination to benefit from scale. From an economic perspective, scale reduces the fixed costs of production, which is key to profitability and financial viability. It also created a network effect, meaning that scientists could learn from a relatively large pool of peers—standing on the shoulders of many giants, as Newton famously put it.

Mokyr’s “culture of growth” matured during the Enlightenment, an intellectual and cultural movement that promoted the progressive improvement of society through the expansion and application of useful knowledge, while advocating for more inclusive political institutions. In hindsight, it was clear why the Enlightenment played such a pivotal role in Mokyr’s theorization: it was the precursor to the Industrial Revolution, which triggered an unprecedented phase of economic growth that lifted much of humanity above subsistence living standards.

An interesting aspect of Mokyr’s theory is its focus on what he calls cultural entrepreneurs—or thought leaders, in today’s parlance—who played an outsized role in the evolution of the culture of growth. Mokyr believed that useful knowledge was created by “a minute percentage of the population” whose primary occupation is, in Adam Smith’s words, “to think and or to reason” for “the vast multitudes that labour.”  In fact,

 what the large majority of workers and peasants knew or believed mattered little as long as there were enough of them to do what they were told by those who knew more.

While Mokyr’s assessment is supported by historical evidence, I imagine many would find such an unapologetically elitist view of cultural development difficult to accept. For me, it feels almost antithetical: growing up in China, my history and political science teachers repeatedly taught, with absolute certainty, that it was proletariats who, through class struggle, drove societal progress and historical development.

Mokyr’s theory can explain why China experienced a burst of intellectual development during the Spring and Autumn and Warring States periods (770 – 221 BCE).  There are striking similarities between the geopolitical conditions of China in this classical era and those of Europe after the High Middle Ages: numerous relatively small states engaged in intense and perpetual competition for dominance, a vast territory with diverse terrain, and a shared cultural tradition including language, institutions, and faith.  Many cultural entrepreneurs—collectively known as “Hundred Schools of Thought”—emerged at this time and left indelible marks on the Chinese Literary Canon.  Like their European counterparts nearly two millennia later, these intellectuals built their reputations by creating and sharing knowledge, and when opportunities arose, they happily crossed the borders of rivalry states to seek more profitable employment for their skills.

As mentioned earlier, in Europe, the greatest achievement of the market of ideas was the Enlightenment. In China, however, a similar market of ideas culminated in a political philosophy that blended Confucianism and Legalism—what I shall refer to as “Confuleg” for lack of a better term (in Chinese, 儒法, or more precisely儒表法里).

Confuleg went on to become the political philosophy that underpinned the key institutions of the Qin-Han Empire, the first to truly unify what is now China under a powerful and centralized state. In the ancient world, this was a towering achievement—socially, politically, and economically. In fact, the state model based on Confuleg was so successful that one could argue, to some extent, China still operates in its long shadow even today.  However, Confuleg’s ascent to hegemony in China was effectively a death sentence for the market of idea.

Since the Qin-Han empire, China has seen dynastic succession once a few hundred years, each usually accompanied by an extended period of turmoil, violence and destruction.

When China is ruled by a centralized state, the Republic of Letters cannot survive, as Mokry’s theory predicts.  Since the best employment opportunity for intellectuals could only be found in the state’s bureaucratic system, producing new knowledge or earning a reputation among peers no longer promises financial security.  Instead, survival requires pledging allegiance to the state (i.e., the emperor himself), internalizing the principles of Confleg as one’s own beliefs and values, and excelling the exams designed to test the ability to memorize and interpret classical texts.   More importantly, the state does not tolerate any competition with its monopoly over ideas.  Questioning the state-sanctioned ideology is viewed not only as heresy but as an act of treason, often carrying the gravest of consequences.

When the centralized state collapsed, one might expect that the ensuing chaos and factional warfare would create an environment favorable for a thriving market of ideas. After all, isn’t that exactly what happened during the Warring States period? Not quite.    The Chinese Canon maintained its powerful grip on intellectuals through these turbulent times. It even survived the brutal and repressive Mongol rule, which lasted nearly a century.  Why?

David Hume (1711 – 1776) observed that few Chinese after the classical period had courage to “dispute what had been universally received by their ancestors.”  John Stewart Mill (1806 – 1873) echoed this view, noting that Chinese tended to “govern their thoughts and conduct by the same maxims and rules,” and as a result (emphasis mine),

they have become stationary—have remained so for thousands of years; and if they are ever to be farther improved, it must be by foreigners.

Today, these words may sound condescending, if not outright discriminatory. However, I often wonder what China might be like today had Westerners never forced their way in. Would it still more or less resemble the world under the reign of Emperor Qianlong in the late 1700s?

Beyond conformity to the same maxims, most Chinese thinkers shared a peculiar, pessimistic nostalgia for a world once ideal and perfect but irretrievably lost. Mokyr identified this trait among the Neo-Confucians—the followers of Cheng Hao, Zhu Xi and Wang Yangming—who dominated the intellectual world during the Ming dynasty.  These scholars regarded antiquity, Mokyr wrote, as “the ideal period, followed by a decline, with no guarantee that the world would ever be better.”   However, the mindset did not originate form Neo-Confucians; it can be traced back to Confucius himself, who lamented the disintegration of the Western Zhou institutions he regarded as ideal, writing

Zhou observed the two preceding dynasties, flourishing with culture and refinement! I follow the Zhou. (周监于二代,郁郁乎文哉!吾从周)

It is hardly surprising that such an inherently backward-looking worldview would become an obstacle to new ideas.

What does Mokyr’s theory suggest about the future of innovation in human society?

The Republic of Letters that once thrived in pre-industrial Europe has long since disappeared, replaced by a vast scientific enterprise supported by a plethora of public and private institutions. However, some key principles from the old republic remain.

First, freedom of expression is still a foundational value. In universities, this is institutionalized through tenure, ensuring that professors’ livelihoods are protected from those who dislike their ideas. Second, a scholar’s value continues to be largely determined by their reputation among peers. This is why peer review, whether for publications or grants, remains the gold standard in academia, despite frequent criticisms of inefficiency, inconsistency, and unfairness.

The value of the science enterprise as an indispensable pillar of modern soceity is almost universally recognized today. Thanks to globalization, science has truly become a global affair: ideas, money, and scholars can now move freely across borders.   This all sounds uplifting until you realize where innovations are first made and adopted still matters a lot.  As Chris Miller explained in Chip War, leadership in science and technology has been the cornerstone of America’s national security strategy.   Until recently, the open science enterprise has served this strategy pretty well.

From pioneering semiconductors to exploring space, from mapping the human genome to advancing artificial general intelligence, the U.S. has consistently led the way. While much of this success can be attributed to America’s global hegemony, her strong commitment to the core values of liberal democracy—free speech, property rights, and limited government—must have also played a crucial role, according to Mokyr’s theory.

The meteoric rise of China apparently has shaken America’s faith in open science.  Reasonable people can disagree on the nature of the current Chinese regime; but few can claim with a straight face that Chinese citizens enjoy much political freedom, as the term is usually understood in the West.  The Chinese do not elect their leaders through open and free elections; their speech is tightly monitored and censored; and they are largely ruled by law, rather than being protected by the rule of law.  In theory, such an environment should be hostile to the market of ideas, hence innovations.

Yet, China has made remarkable strides in science and technology since the turn of the century. By 2025, China is projected to produce nearly twice as many STEM PhD graduates annually as the U.S.  In 2022, Nature, one of the most prestigious scientific publishers, reported that China had surpassed the U.S. to claim the top spot in the Nature Index for natural sciences. Additionally, a recent report indicated that by 2024, China was home to 369 unicorn startups (compared to about 700 in the U.S.), with nearly a quarter focused on AI and semiconductor sectors. Companies like Huawei have become such formidable tech giants that Chris Miller asks nervously in Chip War: “Could the United States allow a Chinese company like this to succeed?”

China’s rapid advances in science and technology raise a fascinating question that Mokyr’s theory seems unable to fully address: can innovation flourish and economic growth be sustained under an authoritarian regime like modern-day China?

If China were isolated from the global science enterprise, I would respond with a resounding “NO.” History has shown that when intellectuals are not allowed to freely speak their minds—as seems to be the case in China today—the market of ideas withers, dragging down opportunities for creative disruption and sustained economic growth.  However, could China simply grab the fruits produced by the global science enterprise, without ever having to maintain a thriving market of ideas of her own?  Could Chinese intellectuals and entrepreneurs continue to be creative and productive in advancing science and technology, even while their other rights, including freedom of speech, are severely impaired?

These are open questions.  However, the U.S., understandably anxious about her security, is not taking any chances. In recent years, she has taken drastic steps to restrict China’s access to cutting-edge technology and to limit interactions between the scientific communities of the two nations, particularly in areas with potential national security implications.   It is disheartening to see the leader of the free world openly retreating from a foundational principle of that world: that science should be freely accessible to all for progress and prosperity.   America’s China Initiative may also lend credibility to the popular narrative of Chinese nationalists that the so-called Westerns values are mere disguise for self-interests –– or worse, deep-seated racism against non-white people.

It is too early to determine whether America’s isolation measures will be effective, or even necessary, in curbing China’s ambition to lead global innovation in the coming century. What we can say with some certainty is that a less open science enterprise will be less vibrant and productive, and likely a less desirable place for scholars, especially those who are stuck between a rock and a hard place.  Politicians and strategists who support the China Initiative argue that this is a price worth paying to protect our freedoms and uphold the liberal world order. Only time will tell if they are right.

Marco Nie, Wilmette

September 22, 2024

Cross-platform ride-hail integration published

After an extended review process that lasted nearly two years, this paper finally came out in Transportation Research Part B.  Thanks Ruijie, the first author, for his extraordinary patience and commitment to scholarship, which have become a rare commodity in today’s hyper-competitive research environment that prioritizes productivity over everything else.

A pre-print of the paper was posted in September 2022 on SSRN, under a different title and with slightly different contents.  You may check it here if you don’t have Elsevier subscription.

翦商:天朝诸神的黄昏

战国以前的古史我所知有限,人物不过尧舜禹汤、文武周召,故实不过汤武伐夏、武王灭纣。商亡周兴这段历史,因为封神演义的缘故,人们耳熟能详。但既然冠以“演义”之名,自然离史实甚远。封神榜背后那段历史的真相到底怎样,这个问题虽说偶尔也滑过心头,但一直没时间深究。年初有朋友推荐李硕的新作《翦商》,言其讲商周之变,颇有见地。我拜读过李硕的《楼船铁马刘寄奴》,写南朝“气吞万里如虎”的刘裕,以正史为纲,作合理想象、适度演绎, 用很有画面感的生动文字呈现给读者,颇有趣味。我好奇的是,如果《翦商》也是这样的风格,现有的上古史料能让史家的想象有立足之地吗?打开书看下来,发现《翦商》讲中原文明在公元前第二个千年的故事,既有宏大主题,也有新颖视角。与《刘寄奴》的大众路线截然不同,《翦商》更像是介于学术著作和科普读物之间的史学大部头,加上对商朝残忍的人祭传统极尽渲染之能事,坚持读完实非易事(尤不宜作睡前读物)。另外,作者对历史人物事件的还原推定,逻辑似不够缜密,而天马行空般地解读易经,更影响了信度。但瑕不掩瑜,如果你想了解中华上古史,或者对天朝几千年兴亡铁律和文化中 “敬鬼神而远之”的传统感兴趣,不妨花点时间读一遍。

《翦商》通过对考古实证和诸多古籍的梳理,以细致的笔法,讲述二里头-夏文化(约公元前1800-1500年),二里岗-早商文明(约公元前1600-1400),以及安阳殷墟-晚商文明(约公元前1200-1045)。叙事主线是翦商,即翦灭商朝,代之以周。全书要义,一言以蔽之:

周灭商后,人祭被周人消除,但周人并未开创一种新的宗教,而是采用世俗的人文主义立场,与极端宗教行为保持距离,不允许其干预现实生活,所谓“敬鬼神而远之”。这奠定了后世中国的文化基础。

有商一代,人祭非常发达。对这一制度的复现及批判,既是全书关注的焦点,也是立论的起点

在描述了早商时期偃师、郑州两处城市遗址留下的各类人祭遗存之后,李硕推断,商朝开国百年以后,人祭已成国家宗教。关于这个宗教形成的逻辑,李硕写到,

灭夏初期,来自多个文化的人群融合成新兴的“王朝商族”,因此,他们需要构建一种维系自我认同的宗教文化,而用人献祭是最为明晰和便捷的方式:借此区分执行献祭的“我们”(商族人)和用来献祭的“他们”(非商族群),由此,商族人获得了独一无二的优越感。换句话说,他们用“野蛮”的异族人敬献诸神和先祖,祈求天界的福佑,从而获得君临大地和统治列族的权柄。

这种推理看似合理,但演绎的色彩比较浓,因为“用来献祭的都是非商族群”这个说法,并无直接证据支持。相比之下,《剑桥中国古代史》(后文引作《剑桥史》)的作者们就含蓄很多。他们写到(注一),二里岗和安阳的人祭遗存说明商文明与同样以人祭闻名的中美洲阿兹特克文明一样,是一种神权政治(theocracy)。商王既是政治领袖,也是负责与神沟通的巫师,他们以甲骨烧烫后产生的裂纹为媒介,记录并执行神的旨意。虽然这种宗教对普罗大众的意义现已无从考证,但它应该首先是为政治服务的工具,其次也是一种信仰体系,功能是造神并把人间福祉与神关联。

不管因何而生,到晚商殷墟时期,血腥野蛮的人祭宗教已蔚然成风。

首先,这一时期墓葬中大量使用人殉。晚商大墓的规制是挖竖穴土坑(有时也包括通向坑壁顶端的倾斜墓道),穴底中央放棺椁,下面先挖腰坑,以狗或人殉葬(“腰坑殉狗”是商代墓葬传统),墓穴四壁做出台阶,称为“二层台”,放殉葬物品或殉葬人牲,有时主墓外还有专门的殉葬坑。用于殉葬的人包括两类,一类为正常安葬,甚至拥有属于自己的殉葬品;另一类明显是处死后陪葬,这里面被砍头、砍脚、腰斩,乃至虐杀活埋,不一而足。据《剑桥史》,疑似安阳殷墟第一代商王武丁的墓内人牲,第一类至少发现了90人,第二类至少有74人。

为强调人殉制度的残忍,李硕以海量篇幅和丰富想象,还原人殉场景。因异常血腥的画面感给我留下深刻印象的例子,是商人砍头习惯从嘴的位置把人头砍掉一半,或者削掉头盖骨。对于后者,李硕推测,

这很可能是蓄意地虐杀,献祭者想要欣赏人牲被砍掉头盖骨之后的挣扎和喊叫,由此获得刺激和满足感。不管是用刀或钺,能如此整齐、完整地砍下人的 头盖骨都是一件很困难的事,所以又有两种可能:一,献祭者是用锯子开颅的;二,操作者已经熟能生巧,可以顺利地砍下完整无缺的头盖骨。

其次,人祭已不再只备筑造、墓葬等一时之需,而成为祭祀“帝”及历代先王的制度化刚需。李硕提到,殷墟仅在王陵区迄今已发现专门的祭祀坑2200座,以每一坑殉十人估算,殷墟近二百年光为国教的祭祀至少用掉了两三万人牲,平均下来,每年至少一百多人。这个数字在量级上,跟甲骨卜辞提供的证据是吻合的:书中援引的考古资料称,卜辞中“有关人祭的甲骨有1350片,卜辞1992条,合计献祭13052人”。

李硕认为,对人牲的需求如此之大,以至于历代商王得依赖在战争中捕获俘虏或者在王朝边界不断“猎捕”少数族裔才能满足;而周朝的祖先,从古公亶父一代迁居周原开始,就充当猎捕者的角色。这是李硕论证其中心观点的第二环。他写到,

自迁居周原,周族始为商朝的附庸族邦,代价则是捕猎周边山地的羌人献给商朝充当人牲。商与周的这种关系,从古公亶父晚年开始,历经季历和周昌两代人,甚至可能持续到灭商之前的周武王初年。

李硕认为易经里益卦的爻辞记录了亶父接受商王任命这一历史事件:

益卦,。。。,顾名思义,就是获得利益。它的六四爻辞是:“中行告公从,利用为依迁国。” 。。。“中行”的字面本意是行军最中间的行列,可能代指战车,因为战车走在道路中间,步卒走在两边。所以,整句翻译为白话是,有人乘着战车来告诉公(亶父):“跟我走,为了殷商朝,你们这个小国搬迁一下,对你们也大有好处”。

我以为,如果晚商献祭规模在每年一百到数百人这个量级,以晚商实际控制区内人口为100万作保守估计(注二),每年自然死亡人口当在3万上下(假定平均寿命35岁),大约是献祭规模的100倍左右。如此似不至于造成需专人负责捕猎人牲的局面。另外,说益卦的六四爻辞是周族成为商朝附庸的文字证据,似乎过于牵强,难以服人。

李硕认为周文王姬昌为翦商大计建立了一套方法论,用不同事件间相互转化的规律(即所谓“易”)来预测未来,而《易经》则是文王建立这套体系的“练习薄”。六十四卦是文王对各种历史事件按某种特殊顺序的排列组合;卦辞和爻辞是对这些事件的记录和解读,如兑卦和坎卦记录了商人的血祭仪式,需卦和小畜卦总结周族充当人牲捕猎者的经验,讼卦有关文王在殷都羡里被监禁的经历,乾卦是对翦商大计的总结,而睽卦甚至描述了文王和姜太公吕尚在殷都屠宰村(殷墟发掘遗址之一)的一次秘密会晤。试以乾卦的“用九”爻辞再举一例。李硕推测说,

 “见群龙无首,吉”,这可能是说文王在殷都生活期间结识各种商朝上层人物,发现他们之间矛盾很深,周族可以找到内应,最终倾覆商朝。

这种推演,乍一看似有理,但细思跟算命先生那种模棱两可,穿凿附会的风格相当神似。

从行文来看,李硕对于文王作易似乎深信不疑。他下笔如此坚定,大概因为易经在书中被描绘成翦商之大纲,其中的卦辞爻辞本身成了支持其中心论点的重要证据。但是文王作易毕竟只是传说,并不十分靠谱。比如《剑桥史》对这个传说就予以干脆的否定,认为易经成书于西周晚期或东周早期的可能性要大得多。这个结论是通过把易经之爻辞卦辞和《诗经》以及西周青铜铭文的语言风格进行对比得到的(注三)。

李硕论证逻辑的第三环,是周人虽一直为商朝血腥人祭宗教服务,但同时也是这个宗教的受害者

首先,因为“周人和羌人有古老的同宗亲缘,对周族来说,替商朝捕猎羌人在道义上是一种耻辱”。其次,人祭给周族首领文王一家带来了惨痛的个体经历。李硕认为封神演义中关于文王长子伯邑考被纣王烹杀,并做成人肉酱赐给臣下分食的传说,确有其事。不过这件骇人听闻的暴行并非纣王对姬家的惩罚,而是考验。具体地说,是册封文王为“周方伯”典礼的程序之一。而文王及其家族,

为了周邦的生存,只能接受商人的宗教礼仪,而且很可能还要尽量表现得心悦诚服和感恩戴德。

据说这件事被文王写进《易经》损卦的六三爻词的前半段里,道作:“三人行,则损一人。”李硕的解释是,“文王被囚禁后,包括伯邑考在内的三个儿子赶往殷都营救,但最终损失了一个”。更有甚者,武王周发长期受噩梦惊扰而需周公为其解梦,乃至“周公吐哺”的传说, 实则都是因为他们吃了大哥的人肉酱心理阴影面积过大留下的后遗症。

李硕认为,出于对人祭的痛恨,成就翦商大业之后的西周政权,在周公姬旦的主导下,开始系统地消灭人祭宗教。为抹去群体记忆,不仅用活人殉葬、祭祀的行为被全面取缔,连记录人祭的部分甲骨资料都遭到破坏。在此过程中,周人也顺理成章地把他们为商王作马仔的黑历史抹得干干净净—就连文王留下的易经,周公也用新加的象传做了重新解释,如乾卦之象就变成了“天行健, 君子以自强不息”这种传播正能量的宣传品,几千年后还被我的母校选为校训。

当然,周公最重要的贡献,是重建信仰体系,让狰狞嗜血的诸神远去,同时引入模糊的“天命”为王权背书,以“仁德”为行为准则,约束生民,也制衡王权。用李硕的话说,

周公消灭了旧华夏文明及其相关记忆,打破了族群血缘壁垒,让尘世生活远离宗教和鬼神世界,不再把人类族群的差异看作神创的贵贱之别。这是华夏文明最彻底的一次自我否定与重生。在三千年前的古人类文明中,只有华夏独自走出了神权的掌 控,成为一个“异类”。

我理解这是《翦商》全书之要义,也是李硕论证的终点。

周公创造的“天命”,高高在上,神秘莫测,世俗中人,无论帝王将相还是贩夫走卒,除了努力提升德行以求眷顾,不再拥有类似烧甲骨那种与其直接沟通的手段。周公思想后来成为儒家文化的基石,而在李硕看来,它的产生和形成,“主要源于对人祭宗教的恐惧,以及消灭人祭宗教的需要”。李硕颇有些自诩地宣称, 这一点,“是后人从未堪破的秘密。”

那么,西周初期真的搞过以消灭人祭宗教为目标的系统工程吗?我认为这个假说,虽然在论证诸环节存在或大或小的问题(见前文分析),但结论基本合理。原因主要有二。

第一、从考古证据来看,大规模的人祭行为在商以后确实绝迹了,甚至到春秋的时候,孔子对用假人俑陪葬都深恶痛绝,乃有“始作俑者,其无后乎”的慷慨陈词。

第二、前朝人祭制度在后世确实不见经传。关于后一点,《剑桥史》写到(注四),

西周典籍控诉商王的主要罪行是酗酒失德,而非血腥暴力。而东周的道学家以及汉代的历史学家对他们崇拜的先王们曾经对人祭如此迷恋这一事实仿佛一无所知,这一点也耐人寻问。

《尚书》中某些篇章的写作时间,应该距晚商很近,很难想象作者对人祭这种核心制度安排会一无所知。另外,如果不是有自上而下且持续不断的努力,存在了几百年的传统何以会消失得如此之快,如此干净?

李硕认为周公通过引入天命,第一次提出了执政合法性的问题和理论。从此,王虽称天子,已不再享有血统上的特殊性,而仅是天命在尘世间的临时载体。这与商朝的神王合一和基督教文明君权神授的理念有本质区别。夏、商、周三代更替的背后,是天命从失道寡助的旧王(朝)向得道多助的新王(朝)跳跃式的转移(注五)。

李硕还写到,“周人重新创造了一套上古圣王的历史, 尧舜禹的温情禅让从此成为华夏世界的标准版历史叙事”。其实何止尧舜禹,就连商汤灭夏的故事,大概也是为灭商的合法性辩护而创造的。迄今为止,夏朝最初见诸中华文字,就是在《尚书》里关于天命及执政合法性的论述。正如《剑桥史》所言,证明政权从商转移到周的合法性迫切需要一个先例,所以周人才依葫芦画瓢搞出了夏崩商立那样几乎完全雷同的剧本(注六)。

与天命论共生共荣的历史叙事也制造了一种假象,即中华文明至迟从夏开始(公元2000年前左右),已经形成了以黄河流域中下游为中心的大一统王朝。中华史学奉夏、商、周为天朝正朔,忽视近现代中国疆域内其他古代文明的传统,即由此而来。严格地说,即便《翦商》的叙事,也未能完全跳出这个大框架。

西方史学界虽然认同二里头(夏)-二里岗(早商)-安阳(晚商)在诸多文化特征上的传承,但认为其时黄河流域之外(如四川和长江流域)还有若干文明与之共存,而夏-商-周这条传统主轴并不能完全“代表”它们。这些域外文明之所以现在声名不著,一方面要归功与周人在灭商后重构历史的丰功伟业,另一方面则是因为中国史学界的民族主义情结 (注七):

要搞清楚周人是如何重构历史的,我们必须去探索周人书写的历史和考古证据揭示的历史之间的差异。不幸的是,对中国考古学家来说,即使承认这种差异存在都相当困难。解读沉默的考古证据的难题无法和民族自尊分离,因为后者要求学者们无条件认同传统史料的可靠性并把考古视为验证而非纠正它们的工具。

抛弃神权,全盘接受周公的天命论,对中华文明之后三千年的发展有何影响?孔子认为这一事件彻底重塑了民族性格:

殷人尊神,率民以事神,先鬼而后礼,先罚而后赏,尊而不亲。其民之敝,荡而不静,胜而无耻。周人尊礼尚施,事鬼敬神而远之,近人而忠焉,其赏罚用爵列,亲而不尊。其民之敝,利而巧,文而不惭,贼而蔽。

李硕把这段话翻译为(重点为我标注):

“殷商统治者尊崇神,要求民众必须敬神,对鬼神的重视程 度超过正常礼俗,对民众的刑罚多于奖赏,多威严而缺少亲和力。这造成了民众性情躁动不安、争强好胜、缺少羞耻感的缺点。周朝统治者则推崇世俗的礼仪,对民众比较宽容,虽然敬拜鬼神, 但不让它们干预人间事务,更重视人间的世俗秩序和信用,人间的身份等级则依据爵位高低有所区别,有亲和力,但缺少威严。这造成了民众趋利且心计巧诈,善于掩饰欲望和自我包装,心中少有真诚,奸滑而有欺骗性的缺点。”

这里孔子间接提到了天命论的一个致命问题:它单纯依赖感召教化的力量,缺乏惩奸罚恶之威严。失去了神的终极威慑,国人不仅“心中少有真诚,奸猾而有欺骗性”,而且做起恶来没有底线,没有心理负担,因为不用担心进不了天堂,得不到救赎,或者跳不出轮回。

因此,天命论在把诸神扫尽历史垃圾堆的同时,也开启了中华三千年兴亡更替、治乱循环的魔盒。

天命从一方向另一方转移的条件和时机,没有客观标准,无法认定。这种模棱两可留下的巨大操作空间,势必造成双方无法调和的矛盾。秦晖在《走出帝制》中,提到汉景帝时期辕固生和黄生关于商汤灭夏合法性的论战,可为天命论所面临的这种两难处境注脚。秦晖写到,“辕固生鼓吹汤武革命推翻暴君,皇上担心今人效法就会犯上作乱;黄生谴责汤武弑君造反是乱臣贼子,皇上又担心会颠覆了高祖起兵以汉代秦的合法性”。 结果,汉景帝只好命令他俩都闭嘴,再不准讨论汤武伐夏合法性这种敏感问题—“食肉不食马肝,不为不知味;言学者无言汤武受命,不为愚。”

西汉还算是天命论的蜜月期,不少读书人相信天命转移真的可以通过天灾祥瑞提前预判,以禅位让贤的方式发生。王莽代汉,就是顺应了西汉中后期这股潮流,在当时可谓民心所向,众望所归。可是后世的传统史家,却几乎不假思索地为他奉上逆臣奸贼的帽子,把明明是根据天命论施行的“代汉”定性为“篡汉”。自汉以后,禅让更是完全演变成你方唱罢我登场的闹剧,当事人不过碍于天命的面子,不得不把过场走全罢了。

在实际操作中,天命只是一张空头支票,没有暴力作后盾,永远无法兑现。而无论是谁,只要手中握有足够强大的暴力机器,就可以做起天命所归的美梦。从陈胜吴广的 “王侯将相,宁有种乎”,到民国时期的“乱世英雄起四方,有枪便是草头王”,无不如是。而根据周公的理论,天命转移的前提,必然是前任天子因失德背道成为暴君,因此,让他们身败名裂,将他们挫骨扬灰,都合理合法。结果,名义上受命于天的天子们永远承受着巨大的心理压力,因为他们执政的合法性非常脆弱,而失去天命的后果非常严重,唯有建立一个金字塔式的庞大官僚体系,把绝对的权力高度集中到自己手中,事无巨细,俱出圣裁,晚上才能勉强睡个安稳觉。如此看来,天命论与中国帝制中对君主集权的强调,以及中国王朝治乱循环中极端暴力的倾向,都息息相关。

最后还有一点需要厘清。诚如李硕所言,天命论让中华文明早熟,独自走出了神权的掌握。但他皓首穷经,似乎是为了论证这个结果是摆脱人祭宗教必需的代价。我以为不然。波斯和两河流域的一神教传统,完全与人祭无关。取缔人祭宗教,完全可以保留甲骨上里那位无所不能的“帝”,仅改革祭祀的方式即可。可以想象,如果把周公换成另一位圣贤(如传说中创立犹太教的摩西),说不定中华也会发展出“有中国特色”、但平和成熟的信仰体系。

总而言之,中华文明在公元前1045年,在一个关键的十字路口,很可能因为完全偶然的原因,选择了以天命替代鬼神之路。这条路,影响深远,三千年连绵不绝,我们至今仍生活在它余荫庇护之下(抑或阴影笼罩之中)。

 

聂宇

2024年8月18日定稿于去国返美途中

注释

注一、《剑桥史》原文为,“Human sacrifice was dedicated above all to the mortuary cult of the Anyang kings…. (While) what this cult meant to the population at large is unknown, …it may have been an instrument of political policy.  。。Sacrifice in Mesoamerica was also sustained by religious beliefs which made the gods and therefore the welfare of human society dependent on it, and sacrifice on the scale seen at Anyang might not have been possible without the support of some similar belief.”

 

注二、 维基百科援引宋镇豪的估计,商朝初年人口约有400万至450万,晚期人口约780万左右,商末人口可以达到800万至1000万左右。纣王时,殷墟王邑人口已达14.6万以上。郭健雄在《中国人口史》中估计晚商人口至少在500万以上。

 

注三、《剑桥史》引80年代初期一博士论文成果称,“In fact, the formal and linguistic comparisons between the text and both the Shijing and bronze inscriptions shows that Zhouyi to have achieved its present form no earlier than the late Western Zhou。”

注四、《剑桥史》原文为:“Western Zhou texts charge the Shang kings with drunkenness, not bloodiness. Eastern Zhou  moralists and Han historians seem curiously unaware that the way of the former kings they so admires revolved around human sacrifice.”

注五、《剑桥史》提到,周公和召公及成王在天命归属的主体上有分歧。周公认为天命归于王朝或是族群;而召公和成王认为天命的承载者只能是王本人。他们的论战记录在《尚书》里。论战的失败一方是周公,而论战的失败也是退居他二线的根本原因。

注六、《剑桥史》原文为:“Legalizing the transfer of rule was achieved by inventing a precedent, an earlier dynasty whose equally universal rule had been lawfully transferred to Shang。”

注七、《剑桥史》原文为,“To discover how the Zhou remade history, we must explore the discrepancy between history as the Zhou reported it and history as recovered by archaeology. For Chinese Archaeologists, unfortunately, it has been difficult to admit that any such discrepancy might exist. The always thorny problem of interpreting mute archeological evidence has been complicated by national pride, which insists that tradition is reliable and that the task of archaeology is to vindicate it.”

Congratulations, Dr. Li

Aabout a week ago (on 7/19/2024), Jiayang Li defended his PhD thesis, entitled “Some New Perspectives on Games in Transportation Systems Analysis” .   His thesis has inspired a successful NSF proposal,  two publications in Transportation Science, one paper under review at Operations Research, and three conference papers in top Machine Learning conferences (ICML and NeurIPs) .

The 11th PhD student graduated from my group,  Jiayang is set to start in September as an Assistant Professor in the Department of Industrial Engineering and Manufacturing Systems at the University of Hong Kong. 

Congratulations, Dr. Li!

Four papers published recently

It so happened that four papers I co-authored came out in the past month – quite a coincidence. Here is the list.

1. A Day-to-Day Dynamical Approach to the Most Likely User Equilibrium Problem, published in Transportation Science, and to be presented in the International Symposium of Transportation and Traffic Theory next week.

2.  The sustainability appeal of urban rail transit, published in Transportation Research Part A.

3. An Autonomous Modular Public Transit service, joint work with Jane Lin and Xi Cheng at UIC, published in Transportation Research Part C, and to be presented in the International Symposium of Transportation and Traffic Theory next week.

4.Is order-2 proportionality good enough for approximating the most likely path flow in user equilibrium traffic assignment? Joint work with Jun Xie and Liyang Feng at Southwest Jiaotong University, published in Transportation Research Part B.

Is Fare Free Transit Just?

I became interested in fare free transit since  Michelle Wu was elected the Major of Boston. She was the first female Asian major of the city, though her reputation as a disciple of Elizabeth Warren, the liberal firebrand in the U.S. senate,  probably overrode her other identities.  Among many of her agenda items was fare free transit (FFT), which caught my attention  not because it is especially progressive, but because it is a transit policy, which I happen to know something about.  Another source of inspiration for this paper came from Steven Dubner’s podcast on the subject a couple of years ago, which is entitled “Should Public Transit be Free”.

I shared the preprint with my department chair, Prof. Kim Gray, who is an environmental engineer but has a broad interest in anything related to sustainability and climate change. She was impressed and asked her assistant, Miss. Gina Twardosz, to write a news article to be posed on the department website. If you don’t want to read the paper itself, here is the link to that article. The abstract follows.


Abstract: Using a stylized transit design model, this study examines fare-free transit (FFT) through the lens of distributive justice. We pose a direct question: Is FFT just according to John Rawls’s theory of justice? Specifically, is it compatible with the resource allocation that maximizes the utility of the most disadvantaged travelers? We compare this egalitarian principle with a utilitarian one, which asserts that an allocation is optimal when it maximizes the total utility of all travelers. FFT is of course not free. In the absence of farebox revenue, a transit system must either cut services or turn to alternative sources, such as local dedicated taxes and fees levied on drivers. Thus, our model incorporates both finance and operational decisions, and captures the interaction between traffic congestion and travelers’ income level and mode choice. Using a case study built with empirical data in Chicago, we show that fare is not the first choice under either moral principle. For the egalitarian, the most desirable funding source is the driver fee, whereas taxation is preferred by the utilitarian. It follows that FFT can be both just and utility-maximizing, if one is allowed to raise taxes and charge drivers with impunity. However, as the flexibility in finance diminishes, so does the appeal of FFT. In such cases, the proposed model serves as a decision-support tool for finding sensible compromises that address the varied interests and ideologies at play. For example, it reveals that at the current tax rate of about 1% in Chicago, the Rawlsian egalitarian can justify FFT only if drivers pay about $1,800/year to fund transit, which amounts to about 18% of an average U.S. household’s driving cost.

Unexpected Data Bias in Smartphone Trace Data

This study, a joint study with Professor Amanda Stathopoulos‘ group, explores the impact of shifting device representation bias in smartphone tracking data collected before and after Apple’s 2021 privacy updates on user location tracking. It demonstrates that privacy regulations can significantly and unexpectedly affect the quality of these data, which are crucial for decision making across governmental, corporate, and academic institutions worldwide. The research also corrects misconceptions about representation bias previously speculated in the literature. Overall, the findings equip users of location-based device data with a better understanding of potential pitfalls, enabling them to anticipate the changes caused by the evolving regulatory landscape and to devise appropriate coping strategies. This finding is contrary to popular concerns about the under-representation of low-income populations in LBS data.

Download the preprint here and read the abstract below:


As smartphones become ubiquitous, practitioners look to the data generated by location-tracking services enabled on these devices as a comprehensive, yet low-cost means of studying people’s daily activities. It is now widely accepted that smartphone data traces can serve as a powerful analytical tool for research and policymaking. As the use of these data grows, though, so too do concerns regarding the privacy regulations surrounding location tracking of private citizens. Here, we examine how Apple’s tightened privacy measures, designed to restrict location-tracking on their devices, affect the quality of passively generated trace data. Using a large sample of such data collected in the Chicago metro area, we discover a significant drop in iOS data availability post-privacy regulations. The results also reveal a surprising puzzle: the reduced tracking is not uniform and contradicts customary concerns about the under-representation bias of low-income population. Instead, we find a negative correlation between device representation level and income, as well as population density. These findings reframe the debate over the increasing reliance on smartphone data, highlighting the need to understand evolving issues in tracking, coverage, and representation, which are essential for the validity of research and planning.