We are going through a financial crisis more severe and unpredictable than any in our lifetime. We have seen the failures, or the equivalent of failures, of Bear Stearns, IndyMac, Lehman Brothers, Washington Mutual, Wachovia, Fannie Mae, Freddie Mac and the American International Group. Each of these failures would be tremendously consequential in its own right. But we faced them in succession, as our financial system seized up and severely damaged the economy.

By September, the government faced a systemwide crisis. After months of making the most of the authority we already had, we asked US Congress for a comprehensive rescue package so we could stabilize our financial system and minimize further damage to our economy.

By the time the legislation had passed on Oct 3, the global market crisis was so broad and so severe that we needed to move quickly and take powerful steps to stabilize our financial system and to get credit flowing again. Our initial intent was to strengthen the banking system by purchasing illiquid mortgages and mortgage-related securities.