Square and Round Customers: Defining Geographic Markets with Willingness to Travel Circles

43 Pages Posted: 12 Oct 2018 Last revised: 7 Nov 2018

See all articles by Shawn W. Ulrick

Shawn W. Ulrick

U.S. Federal Trade Commission (FTC)

Seth B. Sacher

Independent

Paul R. Zimmerman

U.S. Federal Trade Commission - Bureau of Economics

John M. Yun

George Mason University - Antonin Scalia Law School, Faculty

Date Written: November 6, 2018

Abstract

Issues of spatial competition play a key role in many antitrust matters in terms of both defining relevant markets and evaluating competitive effects. One area where this is particularly important is in retail competition. While detailed data for conducting empirical analyses is available in many retail industries, it is often the case that practitioners must define markets, at least preliminarily, under limited information. In this paper, we develop techniques for aiding in defining markets involving spatial competition under limited information.

Keywords: antitrust, spatial competition, retail competition, actual loss, critical loss, SSNIP, significant non-transitory increase in price, HMT, hypothetical monopolist

JEL Classification: K2, K21, L4, L40, L81

Suggested Citation

Ulrick, Shawn W. and Sacher, Seth B. and Zimmerman, Paul R. and Yun, John M., Square and Round Customers: Defining Geographic Markets with Willingness to Travel Circles (November 6, 2018). George Mason Law & Economics Research Paper No. 18-38. Available at SSRN: https://ssrn.com/abstract=3264838 or http://dx.doi.org/10.2139/ssrn.3264838

Shawn W. Ulrick

U.S. Federal Trade Commission (FTC) ( email )

600 Pennsylvania Ave., NW
Washington, DC 20580
United States

Seth B. Sacher

Independent ( email )

No Address Available

Paul R. Zimmerman

U.S. Federal Trade Commission - Bureau of Economics ( email )

601 New Jersey Ave. NW
Rm. 8103
Washington, DC 20580
United States

HOME PAGE: http://paul.r.zimmerman.googlepages.com/

John M. Yun (Contact Author)

George Mason University - Antonin Scalia Law School, Faculty ( email )

3301 Fairfax Drive
Arlington, VA 22201
United States

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