How Financial Madness Overtook Wall Street - TIME

How Financial Madness Overtook Wall Street - TIME: "The market lost faith in AIG too, but the government was forced to save it. A major reason is that AIG is one of the creators of the aforementioned credit-default swaps. What are those, you ask? They're pixie-dust securities that supposedly offer insurance against a company defaulting on its obligations. If you buy $10 million of GM bonds, for instance, you might hedge your bet by buying a $10 million CDS from AIG. In return for that premium — which changes day to day — AIG agrees to give you $10 million should GM have an 'event of default' on its obligations.

But as a way to make sure that swap meisters can make good on their obligations, they have to post collateral. If their credit is downgraded — as was the case with AIG — they have to post more collateral. What put AIG on the brink was that it had to post $14 billion overnight, which of course it didn't have lying around. Next week, the looming downgrades might have forced it to come up with $250 billion. (No, that's not a typographical mistake; it's a real number.) Hence the action. If AIG croaked, all the players who thought they had their bets hedged would suddenly have 'unbalanced books.' That could lead to firms other than AIG failing, which could lead to still more firms failing, which could lead to"