Although it was not widely known, Goldman, a Wall Street stalwart that had seemed immune to its rivals’ woes, was A.I.G.’s largest trading partner, according to six people close to the insurer who requested anonymity because of confidentiality agreements. A collapse of the insurer threatened to leave a hole of as much as $20 billion in Goldman’s side, several of these people said.

Days later, federal officials, who had let Lehman die and initially balked at tossing a lifeline to A.I.G., ended up bailing out the insurer for $85 billion.

Their message was simple: Lehman was expendable. But if A.I.G. unspooled, so could some of the mightiest enterprises in the world.

A Goldman spokesman said in an interview that the firm was never imperiled by A.I.G.’s troubles and that Mr. Blankfein participated in the Fed discussions to safeguard the entire financial system, not his firm’s own interests.

Yet an exploration of A.I.G.’s demise and its relationships with firms like Goldman offers important insights into the mystifying, virally connected — and astonishingly fragile — financial world that began to implode in recent weeks.

Although America’s housing collapse is often cited as having caused the crisis, the system was vulnerable because of intricate financial contracts known as credit derivatives, which insure debt holders against default. They are fashioned privately and beyond the ken of regulators — sometimes even beyond the understanding of executives peddling them.

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Filed under: * Economics, Politics • Economy • Housing/Real Estate Market • Personal Finance • Stock Market

1. Jeffersonian wrote: Maybe Eliot Spitzer shouldn’t have chased ol’ Hank Greenberg out of AIG, eh? September 28, 4:22 pm | [comment link]

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