Search, Selectivity, and Market Thickness in Two-Sided Markets: Evidence from Online Dating

49 Pages Posted: 11 Oct 2019 Last revised: 24 Aug 2020

See all articles by Jessica Fong

Jessica Fong

University of Michigan Ross School of Business

Date Written: June 12, 2020

Abstract

This paper investigates search and matching in online marketplaces, emphasizing how user behavior responds to the presence of others on the platform, which I call ``market thickness". Unlike standard settings in which firms typically benefit from increasing their customer base, in two-sided markets, changes in market thickness can induce complex effects in matching due to the endogenous adjustment of search and selectivity. This paper explores how changes in one side of the marketplace can affect the platform as a whole by causally measuring the independent effects of market size and competition size on behavior. I implement a field experiment that varies information sent to platform participants about the number of potential matches (market size) and number of competitors. I use this experimentally-induced variation to estimate the parameters of a microfounded model to measure general equilibrium matching outcomes. Consistent with intuition and observational patterns, individuals generally become more selective when they are told they have more potential matches, and less selective when they are told they have more competition. I find that an increase in market size does not necessarily increase match quality due to heterogeneous effects of market thickness on selectivity. I then show how changing selectivity by adjusting the cost of sending match proposals may mitigate negative effects of changes in market and competition size.

Keywords: digital markets, two-sided matching, platform design, online dating

Suggested Citation

Fong, Jessica, Search, Selectivity, and Market Thickness in Two-Sided Markets: Evidence from Online Dating (June 12, 2020). Available at SSRN: https://ssrn.com/abstract=3458373 or http://dx.doi.org/10.2139/ssrn.3458373

Jessica Fong (Contact Author)

University of Michigan Ross School of Business ( email )

701 Tappan Ave
Ann Arbor, MI 48109
United States

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