PhD Candidate, Department of Economics

Contact Information
Department of Economics
Northwestern University
2211 Campus Drive
Evanston, IL 60208
Phone: 847-769-9048
sibowang2013@u.northwestern.edu

Education
Ph.D., Economics, Northwestern University, 2019 (expected)
BA, Economics, Mathematics, MMSS, Northwestern University, 2013.

Primary Field of Specialization
Industrial Organization

Curriculum Vitae

Download Vita (PDF)

Job Market Paper

“Competitive Effects of Constraints on Quality: Evidence from U.S. Airline Industry” with Yi Sun

Download Job Market Paper (PDF)

Regulations often impose quality restrictions on firms, which in turn can influence prices and welfare in a theoretically ambiguous manner. To study such quality restrictions, we investigate the Wright Amendment by analyzing its full repeal in 2014 as a natural experiment in order. The Wright Amendment constrained airlines to offer only connected flights on many routes out of Dallas Love Field Airport. Given Southwest was the only airline serving those routes using Dallas Love Field, we interpret the Wright Amendment as imposing quality restrictions on Southwest. Using a difference-in-differences methodology, we find that prices of all airlines’ tickets in the affected routes were higher when Southwest’s quality was constrained. In order to decompose this price effect of quality restrictions, we then build a structural model, in which firms choose prices and product quality, measured by the level of nonstop service. We find that Southwest’s markup in the affected markets was higher when it was constrained by the Wright Amendment because its demand was less price elastic. For Southwest’s competitors, the increase in prices was largely a result of higher marginal cost, as their markups did not increase.

Teaching
Industrial Organization, Game Theory, Microeconomics

References
Prof. Robert Porter (Committee Chair)
Prof. Vivek Bhattacharya
Prof. Mar Reguant
Prof. William Rogerson