Recommended readings (Machine generated): Michael R. Baye and John Morgan (2001), 'Information Gatekeepers on the Internet and the Competitiveness of Homogeneous Product Markets', American Economic Review, 91 (3), June, 454-74 -- Jean-Charles Rochet and Jean Tirole (2003), 'Platform Competition...

This paper provides a data-driven overview of the different online platforms that consumers use to search for books and booksellers, and documents how the use of these platforms is shifting over time. Our data suggest that, as a result of digitization, consumers are increasingly conducting...