The first part of this paper derives the Market Pricing Maxim (MPM): market transaction prices fully reflect available information. This is not the same as the efficient market hypothesis (EMH). The MPM holds whether prices are unbiased estimates of fundamental value, as the EMH hypothesizes, or...

Joseph Stiglitz shared the Nobel Prize in 2001 partly on the basis of an important paper of his (with Greenwald): "Externalities in Economies with Imperfect Information and Incomplete Markets." In that paper he says: "There exist government interventions (e.g., taxes and subsidies) that can make...

We hypothesize that high stock price levels impede informed trading on the stocks and reduce price informativeness. This is because uninformed trading is needed to facilitate informed trading, and high stock prices may impose budget constraints on uninformed investors. Indeed, we find, for...

Hou and Moskowitz (2005) use the stock price delay in reflecting market-wide information to measure market frictions each individual firm faces. In this study, to better understand how the price formation process is affected by the business cycle, we examine the relation between changes in the...