This paper argues that an important part of movements in asset prices may be caused by neither external news nor irrationality but by the revelation of information by the trading process itself. Two models are developed that illustrate this general idea. One model is based on investor...

This paper links the "coordination failure" and "menu cost" approaches to the microeconomic foundations of Keynesian macroeconomics. If a firm's desired price is increasing in others' prices, then the gain from price adjustment after a nominal shock is greater if others adjust. This "strategic...