Daron Acemoğlu, Ali Makhdoumi, Azarakhsh Malekian, Asuman Ozdaglar, 18 November 2019

The Cambridge Analytica scandal highlighted the sophisticated ways social media platforms can allow companies to infer information about users and non-users from shared data. This column shows how correlations between platform users’ and non-users’ characteristics mean companies can obtain data at below equilibrium prices, implying welfare inefficiencies for individuals. The authors make some suggestions of regulations that could improve on these data-sharing inefficiencies for users and non-users of the platforms.

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