A review of major lines of thinking about developments in the 1980s bearing on the likelihood of a financial crisis in the United States supports four principal conclusions:First, financial crises have historically played a major role in large fluctuations in business activity. A financial...

Busts after periods of prolonged prosperity have been found to be catastrophic. Financial institutions increase their leverage and shift their portfolios towards projects that were previously considered too risky. This results from institutions rationally updating their expectations and becoming...