Volatility in financial markets has forced economists to reexamine the validity of the efficient markets hypothesis, and new empirical approaches have been applied to the study of this important issue in recent years. Many of the recent studies have found evidence of excessive volatility. In the...

The failure of Lehman Brothers highlighted the severe lapses in risk management and regulatory oversight that brought on and intensified the global financial crisis. This paper presents a structural credit risk model that provides useful early warning signals that regulators could have used to...