It's Not 1929, but It's the Biggest Mess Since

What we know now, of course, is that the investment banks and ratings agencies underestimated the risk that mortgage defaults would rise so dramatically that even AAA investments could lose their value.

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One analysis, by Eidesis Capital, a fund specializing in CDOs, estimates that, of the CDOs issued during the peak years of 2006 and 2007, investors in all but the AAA tranches will lose all their money, and even those will suffer losses of 6 to 31 percent.

And looking across the sector, J.P. Morgan's CDO analysts estimate that there will be at least $300 billion in eventual credit losses, the bulk of which is still hidden from public view. That includes at least $30 billion in additional write-downs at major banks and investment houses, and much more at hedge funds that, for the most part, remain in a state of denial.

As part of the unwinding process, the rating agencies are in the midst of a massive and embarrassing downgrading process that will force many banks, pension funds and money market funds to sell their CDO holdings into a market so bereft of buyers that, in one recent transaction, a desperate E-Trade was able to get only 27 cents on the dollar for its highly rated portfolio.

Meanwhile, banks that are forced to hold on to their CDO assets will be required to set aside much more of their own capital as a financial cushion. That will sharply reduce the money they have available for making new loans.

And it doesn't stop there. CDO losses now threaten the AAA ratings of a number of insurance companies that bought CDO paper or insured against CDO losses. And because some of those insurers also have provided insurance to investors in tax-exempt bonds, states and municipalities have decided to pull back on new bond offerings because investors have become skittish.

If all this sounds like a financial house of cards, that's because it is. And it is about to come crashing down, with serious consequences not only for banks and investors but for the economy as a whole.

That's not just my opinion. It's why banks are husbanding their cash and why the outstanding stock of bank loans and commercial paper is shrinking dramatically.

It is why Treasury officials are working overtime on schemes to stem the tide of mortgage foreclosures and provide a new vehicle to buy up CDO assets.

It's why state and federal budget officials are anticipating sharp decreases in tax revenue next year.

And it is why the Federal Reserve is now willing to toss aside concerns about inflation, the dollar and bailing out Wall Street, and move aggressively to cut interest rates and pump additional funds directly into the banking system.

This may not be 1929. But it's a good bet that it's way more serious than the junk bond crisis of 1987, the S&L crisis of 1990 or the bursting of the tech bubble in 2001.