While a fast-growing body of research has looked at how the advent and di®usion of e- commerce has a®ected prices, much less work has investigated e-commerce's impact on the number and type of ¯rms operating in an industry. This paper theoretically and empirically takes up the question of...

Using a large data set on consumers' web browsing and purchasing behavior we contrast various classical search models. We find that the benchmark model of sequential search with a known distributions of prices can be rejected based on the recall patterns we observe in the data. Moreover, we show...

We empirically study bidding in the C Block of the US mobile phone spectrum auctions. Spectrum auctions are conducted using a simultaneous ascending auction design that allows bidders to assemble packages of licenses with geographic complementarities. While this auction design allows the market...