The strategic use of download limits by a monopoly platform

We offer a new explanation for why platforms, such as Internet service providers and mobile‐phone networks, offer plans with download limits: through one of two mechanisms, doing so causes content providers to reduce prices or improve quality. This generates greater surplus for consumers, which a platform captures via higher consumer access fees. Even accounting for congestion externalities, a platform limits downloads more than would be welfare maximizing; indeed, by so much, that barring such practices can be welfare superior to what a platform would do. Paradoxically, a platform will install more bandwidth when it can restrict downloads than when it cannot.