Recurrent instability has characterized the global financial system since the 1980s, eventually leading to the current global financial crisis. This instability and the resultant disruptions - sovereign debt defaults, exchange rate misalignments, financial market illiquidity and asset price...

Uncertainty about the riskiness of new financial products was an important factor behind the U.S. credit crisis. We show that a boom-bust cycle in debt, asset prices and consumption characterizes the equilibrium dynamics of a model with a collateral constraint in which agents learn "by...