The subprime mortgage crisis ranks among the most serious economic events affecting the United States since the great depression of the 1930s. This study analyzes key issues raised by the crisis at three levels: (i) issues directly and specifically relating to subprime mortgage lending
(ii) issues relating to the securitization of subprime mortgages
and (iii) issues affecting financial markets and institutions. These issues are fundamental to risk bearing, sharing, and transfer in financial markets and institutions around the world. Many of the issues raised by the U.S. subprime crisis also apply to high-risk loan markets in developing countries. The framework applied in the paper analyzes subprime mortgage lending as a major financial market innovation. Although conditions were conducive for subprime lending to arise as a financial innovation, financial innovations are necessarily risky undertakings, all the more so when they create new classes of risky loans and securities. The lessons learned from the crisis can thus be usefully applied to issues of the growth and development of emerging economies, as well as pointing the way to the design of new and efficient policies for subprime lending in the developed economies.