The Credit Crisis Could Be Just Beginning

These triple-borrowed assets were then in turn increasingly used as collateral for commercial paper -- the short-term borrowings of banks and corporations -- which was purchased by supposedly low-risk money market funds.

According to Das' figures, up to 53% of the $2.2 trillion of commercial paper in the U.S. market is now asset-backed, with about 50% of that in mortgages.

When you add it all up, according to Das' research, a single dollar of "real" capital supports $20 to $30 of loans. This spiral of borrowing on an increasingly thin base of real assets, writ large and in nearly infinite variety, ultimately created a world in which derivatives outstanding earlier this year stood at $485 trillion -- or eight times total global gross domestic product of $60 trillion.

Without a central governmental authority keeping tabs on these cross-border flows and ensuring a standard of record-keeping and quality, investors increasingly didn't know what they were buying or what any given security was really worth.

A Painful Unwinding

Here is where the U.S. mortgage holder shows up again. As subprime loan default rates doubled, in contravention of what the models forecast, the CDOs those mortgages backed began to collapse. Because these instruments were so hard to value, banks and funds started looking at all CDOs and other paper backed by mortgages with suspicion, and refused to accept them as collateral for the sort of short-term borrowing that underpins today's money markets.