I analyze the market for compact discs using an original data set of items listed for sale online. Over 5000 listings of both new and used compact discs were collected from eBay (which provides sellers a choice between two mechanisms: auction or posted price) and its subsidiary, Half.com (which...

We focus on the relationship between a player's effort provision and tournament heterogeneity in a setting where players only know the distribution of their opponents' abilities. By isolating whether increases in heterogeneity influence optimal effort provision in cardinal, ordinal, and piece...