Among the facts and causes Posner identifies are: excess savings flowing in from Asia and the reckless lowering of interest rates by the Federal Reserve Board; the relation between executive compensation, short-term profit goals, and risky lending; the housing bubble fuelled by low interest rates, aggressive mortgage marketing, and loose regulations; the low savings rate of American people; and the highly leveraged balance sheets of large financial institutions.
Posner analyzes the two basic remedial approaches to the crisis, which correspond to the two theories of the cause of the Great Depression: the monetarist--that the Federal Reserve Board allowed the money supply to shrink, thus failing to prevent a disastrous deflation--and the Keynesian--that the depression was the product of a credit binge in the 1920's, a stock-market crash, and the ensuing downward spiral in economic activity. Posner concludes that the pendulum swung too far and that our financial markets need to be more heavily regulated. Read Richard Posner's blog, and his latest article in The Atlantic.