Price comparison websites, where consumers can compare prices at a search cost that is close to zero, have become increasingly common around the world. Using daily information on prices, click-throughs, and the number of retailers for a sample of consumer electronics and durable goods over a...

We use Swedish data on 330,000 consumer choices of medically equivalent drugs to study the zero-price effect first documented by Shampanier et al. (2007) in experimental settings. The Swedish benefit scheme implies that, during a given month, all consumers face the same price-differences between...