A Leverage Theory of Tying in Two-Sided Markets Jay Pil Choiy Doh-Shin Jeonz March 13, 2018 Abstract Motivated by recent antitrust cases in markets with zero-pricing, we develop a lever- age theory of tying in two-sided markets. In the presence of the non-negative price constraint, tying provides a mechanism to circumvent the constraint in the tied mar- ket without inviting aggressive responses by the rival …rm. We identify conditions under which tying in two-sided markets is pro…table and explore its welfare impli- cations. In addition, we show that our model can be applied more widely to any markets in which sales to consumers in one market can generate additional revenues that cannot be competed away due to non-negative price constraints. JEL Codes: D4, L1, L5 Key Words: Tying, Leverage of monopoly power, Two-sided markets, Zero pricing, Non-negative pricing constraint We thank Bernard Caillaud, Federico Etro, Bruno Jullien, Massimo Motta, Andras Niedermayer, Volker Nocke, James Peck, Martin Peitz, Patrick Rey, Kyoungwon Rhee, Greg Taylor, Chengsi Wang, Huanxing Yang and participants in various conferences and seminars for valuable discussions and com- ments. Taeyoon Hwang and Sungwook Koh provided excellent research assistance. This work was supported by the Ministry of Education of the Republic of Korea and the National Research Foundation of Korea (NRF-2016S1A5A2A01022389). Jeon acknowledges the …nancial support of the Jean-Jacques La¤ont Digital Chair. yDepartment of Economics, Michigan State University, 220A Marshall-Adams Hall, East Lansing, MI 48824 -1038. E-mail:
[email protected]. zToulouse School of Economics, University of Toulouse Capitole (IDEI) and CEPR.