The $55 trillion question

As Congress wrestles with another bailout bill to try to contain the financial contagion, there's a potential killer bug out there whose next movement can't be predicted: the Credit Default Swap.

In just over a decade these privately traded derivatives contracts have ballooned from nothing into a $54.6 trillion market. CDS are the fastest-growing major type of financial derivatives. More important, they've played a critical role in the unfolding financial crisis. First, by ostensibly providing "insurance" on risky mortgage bonds, they encouraged and enabled reckless behavior during the housing bubble.

"If CDS had been taken out of play, companies would've said, 'I can't get this [risk] off my books,'" says Michael Greenberger, a University of Maryland law professor and former director of trading and markets at the Commodity Futures Trading Commission. "If they couldn't keep passing the risk down the line, those guys would've been stopped in their tracks. The ultimate assurance for issuing all this stuff was, 'It's insured.'"

Second, terror at the potential for a financial Ebola virus radiating out from a failing institution and infecting dozens or hundreds of other companies - all linked to one another by CDS and other instruments - was a major reason that regulators stepped in to bail out Bear Stearns and buy out AIG (AIG, Fortune 500), whose calamitous descent itself was triggered by losses on its CDS contracts (see "Hank's Last Stand").

And the fear of a CDS catastrophe still haunts the markets. For starters, nobody knows how federal intervention might ripple through this chain of contracts. And meanwhile, as we'll see, two fundamental aspects of the CDS market - that it is unregulated, and that almost nothing is disclosed publicly - may be about to change. That adds even more uncertainty to the equation.

"The big problem is that here are all these public companies - banks and corporations - and no one really knows what exposure they've got from the CDS contracts," says Frank Partnoy, a law professor at the University of San Diego and former Morgan Stanley derivatives salesman who has been writing about the dangers of CDS and their ilk for a decade. "The really scary part is that we don't have a clue." Chris Wolf, a co-manager of Cogo Wolf, a hedge fund of funds, compares them to one of the great mysteries of astrophysics: "This has become essentially the dark matter of the financial universe."

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