What caused the global financial crisis? And how can the United States avoid a repeat? Those questions have sparked endless discussions among economists, policymakers, financiers, and voters over the last decade. The crisis not only entailed the worst financial shock and recession in the United States since 1929; it also shook the country’s global reputation for financial competence. Numerous explanations have been offered: the U.S. Federal Reserve kept interest rates too low, Asia’s savings glut drove up the U.S. housing market, the banks had captured regulators and politicians in Washington, mortgage lenders made foolish loans, the credit-rating agencies willfully downplayed risks.