We report on experimental evidence rationalizing the use of heterogeneous agent models. We provide compelling evidence that subjects in laboratory experiments often behave in ways that depart from the rational choice ideal. Further, these subjects' heuristic approaches often differ from one...

The continuous double auction (CDA) is a well-studied, widely used institution for trading. But there is no generally accepted theory about the dynamics of price formation within the first period that has survived experimental testing. In this paper, we describe a model of behavior (called...