We identify two issues in Choi's (2010) paper on tying in two-sided markets published in this Journal, and provide solutions to both of them. First, we point out that the equilibrium in the absence of tying requires more restrictive conditions and does not satisfy a natural equilibrium refinement criterion. We offer an alternative timing structure that validates the equilibrium derived in Choi (2010) under the conditions provided there. Second, we show that his equilibrium analysis with tying ignores a profitable deviation. We rectify this analysis under our alternative timing structure and derive the (mixed-strategy) equilibrium with tying. We also show by means of simulations that tying is welfare-enhancing whenever it is profitable, which is consistent with the main finding in Choi (2010).
Tying; Two-Sided Markets; Multi-Homing;
- D4: Market Structure and Pricing
- L1: Market Structure, Firm Strategy, and Market Performance
- L5: Regulation and Industrial Policy
Jay Pil Choi, Bruno Jullien et Yassine Lefouili, « Tying in Two-Sided Markets with Multi-Homing: Corrigendum and Comment », The Journal of Industrial Economics, vol. 65, n° 4, décembre 2017, p. 872–886.
Jay Pil Choi, Bruno Jullien et Yassine Lefouili, « Tying in Two-Sided Markets with Multi-Homing: Corrigendum and Comment », TSE Working Paper, n° 17-850, octobre 2017.
TSE Working Paper, n° 17-850, octobre 2017