Between the summer of 2007 and the spring of 2009, the U.S. economy was gripped by an acute liquidity and credit crunch, by all accounts, the most severe financial crisis since the Great Depression. Throughout this period of extreme financial turmoil, credit spreads the difference in yields between various private debt instruments and government securities of comparable maturity served as a crucial gauge of the degree of strains in the financial system. In addition, movements in credit spreads were thought to contain important signals regarding the evolution of the real economy and risks to the economic outlook, a view supported by the insights from the large literature on the predictive content of credit spreads or asset prices more generally for economic activity.