Leila Agha, Dan Zeltzer, 25 November 2019

Pharmaceutical companies often market their drugs to highly connected physicians through monetary or in-kind transfers. The column examines how peer influence broadened the influence of the payments for three drugs between 2014 and 2016. Following a large payment, prescriptions for the target drug by the paid physician and the physician's peers increased, with peer spillovers contributing a quarter of the increase.

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