This paper explores the incentives for, and the effects of, collusion in prices between two-sided platforms. We … a single side of the market. Under two-sided collusion, prices on both sides are higher than competitive prices …-group externalities makes two-sided collusion at a given profit level harder to sustain, and reduces the harm from collusion suffered by …

sustainability of collusion in an infinitely repeated game framework. We show that the bundling strategy of the entrant might hinder … collusion. Futhermore, we consider a setting in which the entrant uses a one-way access that the incumbent possesses. In such … might increase the feasibility of collusion. This result has an important policy implication …

and compare two forms of collusion: in the first, publishers cooperatively select both prices and political position; in … differentiation outcome does not depend on the size of the advertising market. We thus show that collusion on prices reinforces the …