Losses at these arms in recent years crippled firms such as Merrill Lynch & Co. and Citigroup. This year, trading has generated windfalls. In the first half of 2009, the top five firms generated $56 billion in trading revenue, compared with $22 billion in the first half of 2008 for those banks and the firms they acquired, and $58 billion at the boom's peak. On 46 separate days in the second quarter, Goldman's traders pocketed at least $100 million in revenue, while losing money on two days.

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