Stephan Seiler

Visiting Associate Professor of Marketing
"In online markets we observe consumer behavior at a much greater level of granularity than in the offline world. I am fascinated by how we can use such data to better understand consumer needs and to tailor marketing activity."
Areas of Expertise:
  • Consumer Search
  • Demand Estimation
  • Empirical IO
  • Online Word-of-mouth
  • Quantitative Marketing


Stephan Seiler’s research focuses on consumer choice in various markets. He analyzes issues ranging from the choice of hospital for a bypass operation to the reaction of consumers to promotions of laundry detergent. He is particularly interested in understanding consumer search behavior, such as how informed consumers are about prices or other product characteristics when making a purchase decision. Another strand of his research analyzes the production and impact of user-generated content on platforms such as Wikipedia and Twitter.


Ph.D. Economics, 2011, London School of Economics

M.Sc. Economics, 2006, London School of Economics

Diplom-Volkswirt, 2005, Universität Freiburg

Does Online Word-of-Mouth Increase Demand? (and How?) Evidence from a Natural Experiment (with Song Yao and Wenbo Wang) Marketing Science, December 2017, 36(6), pp. 838-861.

The Impact of Advertising along the Conversion Funnel (with Song Yao)
Quantitative Marketing and Economics, September 2017, 15(3), pp. 241-278.
Runner-up, Dick Wittink Award, 2018

Multi-Category Competition and Market Power: A Model of Supermarket Pricing (with Øyvind Thomassen, Howard Smith and Pasquale Schirald)
American Economic Review, August 2017, 107(8), pp. 2308-2351.

Estimating Search Benefits from Path-Tracking Data: Measurement and Determinants (with Fabio Pinna)
Marketing Science, July 2017, 36(4), pp. 565-589

Free to Choose? Reform, Choice and Consideration Sets in the English National Health Service (with Martin Gaynor and Carol Propper)
American Economic Review, November 2016, 106(11), pp. 3521-3557.
Kenneth J. Arrow Award for the Best Paper in Health Economics in 2016

Cumulative Growth in User-Generated Content Production: Evidence from Wikipedia (with Aleksi Aaltonen)
Management Science, July 2016, 62(7), pp. 2054-2069.

The Impact of Competition on Management Quality: Evidence from Public Hospitals (with Nicholas Bloom, Carol Propper and John Van Reenen)
Review of Economic Studies, April 2015, 82(2), pp. 457-489.

The Impact of Search Costs on Consumer Behavior: A Dynamic Approach
Quantitative Marketing and Economics, June 2013, 11(2), pp. 155-203 (Lead article).
Dick Wittink Award, 2014

Estimation of Preference Heterogeneity in Markets with Costly Search (with Xiaojing Dong, Ilya Morozov and Liwen Hou)
Revise and resubmit at Marketing Science.

The Impact of Soda Taxes: Pass-through, Tax Avoidance, and Nutritional Effects (with Anna Tuchman and Song Yao)

Large-Scale Demand Estimation with Search Data (with Tomomichi Amano and Andrew Rhodes)