Information markets are markets for contracts that yield payments based on the outcome of an uncertain future event. They are used to predict a wide range of events, from presidential elections to printer sales. These markets frequently outperform both experts and opinion polls, and many...

Many markets rely on information intermediation to sustain cooperation between large communities. We identify a key trade-off in costly information intermediation: intermediaries can create trust by incentivizing information exchange, but with too much information acquisition, intermediation...