Traditional finance is built on the rationality paradigm. This chapter discusses simple models from an alternative approach in which financial markets are viewed as complex evolutionary systems. Agents are boundedly rational and base their investment decisions upon market forecasting heuristics....

We investigate expectation formation in a controlled experimental en-vironment. Subjects are asked to predict the price in a standard asset pricingmodel. They do not have knowledge of the underlying market equilibrium equa-tions, but they know all past realized prices and their own predictions....

We investigate the effect of preannounced market intervention on an asset price as well as participants' welfare in an experimental frame- work where participants have consumption smoothing motives to trade the asset. The results show that, on one hand, the preannounced inter- vention results in...