We are in the midst of a global crisis that will unquestionably rank as the most virulent since the 1930s. It will eventually subside and pass into history. But how the interacting and reinforcing causes and effects of this severe contraction are interpreted will shape the reconfiguration of our currently disabled global financial system.

There are at least two broad and competing explanations of the origins of this crisis. The first is that the "easy money" policies of the Federal Reserve produced the U.S. housing bubble that is at the core of today's financial mess.

The second, and far more credible, explanation agrees that it was indeed lower interest rates that spawned the speculative euphoria. However, the interest rate that mattered was not the federal-funds rate, but the rate on long-term, fixed-rate mortgages. Between 2002 and 2005, home mortgage rates led U.S. home price change by 11 months. This correlation between home prices and mortgage rates was highly significant, and a far better indicator of rising home prices than the fed-funds rate....

Global market competition and integration in goods, services and finance have brought unprecedented gains in material well being. But the growth path of highly competitive markets is cyclical. And on rare occasions it can break down, with consequences such as those we are currently experiencing. It is now very clear that the levels of complexity to which market practitioners at the height of their euphoria tried to push risk-management techniques and products were too much for even the most sophisticated market players to handle properly and prudently.

However, the appropriate policy response is not to bridle financial intermediation with heavy regulation. That would stifle important advances in finance that enhance standards of living. Remember, prior to the crisis, the U.S. economy exhibited an impressive degree of productivity advance. To achieve that with a modest level of combined domestic and borrowed foreign savings (our current account deficit) was a measure of our financial system's precrisis success. The solutions for the financial-market failures revealed by the crisis are higher capital requirements and a wider prosecution of fraud -- not increased micromanagement by government entities.

Any new regulations should improve the ability of financial institutions to effectively direct a nation's savings into the most productive capital investments. Much regulation fails that test, and is often costly and counterproductive. Adequate capital and collateral requirements can address the weaknesses that the crisis has unearthed. Such requirements will not be overly intrusive, and thus will not interfere unduly in private-sector business decisions.