Should platforms be allowed to sell on their own marketplaces?
研究了平台既运营市场又自营产品的双模式，分析禁止该模式对消费者剩余和福利的影响，发现相比全面禁止，防止平台模仿和自优先的政策效果更好。
Abstract A growing number of digital platforms operate in a dual mode: running marketplaces for third‐party products, while selling their own products on those marketplaces. We build a model to explore the implications of this controversial practice. We analyze the tradeoffs that arise from a regulatory ban on the dual mode, showing how such a ban can harm consumer surplus and welfare even when the platform would otherwise engage in product imitation and self‐preferencing. In the empirically most relevant scenarios, policies that prevent platform imitation and self‐preferencing generate better outcomes than an outright ban on the dual mode.