Increased (Platform) Competition Reduces (Seller) Competition
研究发现，当在线平台既做市场又当卖家时，增加平台间的竞争反而可能削弱卖家之间的竞争，最终损害消费者利益。
ABSTRACT Policymakers have expressed concern that when a dominant online platform acts both as a marketplace and as an active seller, it might disadvantage its rival sellers and thereby harm consumers. I examine whether platform competition might be promoted to protect consumers. Perhaps surprisingly, I find that increased platform competition can reduce seller competition, and thereby harm consumers.