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- Collusion in mixed oligopolies and the coordinated effects of privatizationPublication . Correia-da-Silva, João; Pinho, JoanaWe study the sustainability of collusion in mixed oligopolies where private and public firms only differ in their objective: private firms maximize profits, while public firms maximize total surplus. If marginal costs are increasing, public firms do not supply the entire market, leaving room for private firms to produce and possibly cooperate by restricting output. The presence of public firms makes collusion among private firms harder to sustain, and maybe even unprofitable. As the number of private firms increases, collusion may become easier or harder to sustain. Privatization makes collusion easier to sustain, and is socially detrimental whenever firms are able to collude after privatization (which is always the case if they are sufficiently patient). Coordinated effects thus reverse the traditional result according to which privatization is socially desirable if there are many firms in the industry.
- Collusion in two-sided marketsPublication . Lefouili, Yassine; Pinho, Joana
- Collusion between two-sided platformsPublication . Lefouili, Yassine; Pinho, JoanaWe study the price and welfare effects of collusion between two-sided platforms and show that they depend on whether collusion occurs on both sides or a single side of the market, and whether users single-home or multi-home. Our most striking result is that one-sided collusion leads to lower (resp. higher) prices on the collusive (resp. competitive) side if the cross-group externalities exerted on the collusive side are positive and sufficiently strong. One-sided collusion may, therefore, benefit the users on the collusive side and harm the users on the competitive side. Our findings have implications regarding cartel detection and damages actions.
- Horizontal mergers between multisided platforms: insights from cournot competitionPublication . Correia-da-Silva, Joao; Jullien, Bruno; Lefouili, Yassine; Pinho, JoanaThis paper discusses the literature on horizontal mergers between multisided platforms and argues that the Cournot model can provide useful insights into the welfare effects of such mergers. To illustrate those insights, we develop a simple model in which two‐sided platforms offer a homogeneous service and compete à la Cournot, and derive the effects of “average‐marginal‐cost‐preserving” mergers on consumers on both sides of the market. We conclude with a discussion of several research avenues that could be explored to understand better the impact of horizontal mergers between multisided platforms.