From BusinessWeek | The world’s largest hedge funds are approaching their previous peak assets after recovering from their worst-ever losses in 2008, but some analysts are asking just how much money is too much for a hedge-fund manager. In 2008, Chicago-based Citadel Investment Group, whose assets had climbed to about $20 billion, lost 55 percent in its biggest funds after wagers on stocks and mortgage-backed products went awry.

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