In September 2008, the crisis reached panic proportions. Fannie Mae and Freddie Mac, government-sponsored enterprises (GSEs) that supported a large proportion of the mortgage market, were taken into government conservatorship. Lehman Brothers, a major investment bank, declared bankruptcy. The government acquired most of the equity in American International Group (AIG), one of the world's largest insurers, in exchange for an emergency loan from the Federal Reserve (Fed). These firms were seen by many, either at the time or in hindsight, as 'too big to fail' firms whose failure would lead to contagion that would cause financial problems for counterparties or would disrupt the smooth functioning of markets in which the firms operated. One example of such contagion was the failure of a large money market fund holding Lehman Brothers debt that caused a run on many similar funds, including several whose assets were sound.
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