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Should platforms be liable for harms suffered by users? A platform enables
interactions between firms and users. Harmful firms impose larger costs on users
than safe firms. If firms have deep pockets and are fully liable for harms, platform
liability is unnecessary. If firms have limited liability, holding platforms liable for
residual harm increases platforms' incentives to raise interaction prices and invest
in auditing to deter, detect, and block harmful firms. The social desirability and
optimal level of platform liability depend on whether interactions require user con-
sent, the degree to which users internalize harms, and the observability of platform
effort.