THE old-fashioned financial system was like Old Maid, a parlour game once beloved of small children. The banks were like players, dealt hands from a pack of cards, which they swapped among each other. At the end, one player was left holding a lonely queen””a bad debt, if you will””and lost. Over the past few decades the game has changed. Securitisation has snipped the old maid into pieces; new faces, such as hedge funds, have joined the party, enabling the banks to distribute those pieces among a larger number of players. When the game is over, lots of players are left holding small losses instead of one player holding a big one.
During two exceedingly prosperous decades, that theory seemed to work just fine. But the swings in almost all financial markets this month have made dispersed risk suddenly morph into dispersed mistrust. The uncertainty has been magnified by the way that bad risks have become so hard to value. Investors have bought asset-backed securities that use shaky subprime mortgages in America as collateral, but as defaults have risen, the value of that collateral has tumbled.