We study markets for information in the form of Bayesian signals. The main feature of such markets is that information is costly for the seller to acquire and cannot be verified by the buyer. We provide a full characterization of the set of all compensation schemes (viz., menus) which guarantee...

Uncertain information is frequently confirmed or retracted after people have initially heard it. A large existing literature has studied how people change their beliefs in response to new information, however, how people react to information about previous information is still unclear. We...