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For years, investors, rivals and regulators all wondered how Bernard L. Madoff worked his magic.

But on Friday, less than 24 hours after this prominent Wall Street figure was arrested on charges connected with what authorities portrayed as the biggest Ponzi scheme in financial history, hard questions began to be raised about whether Mr. Madoff acted alone and why his suspected con game was not uncovered sooner.

As investors from Palm Beach to New York to London counted their losses on Friday in what Mr. Madoff himself described as a $50 billion fraud, federal authorities took control of what remained of his firm and began to pore over its books.

[...]

According to an affidavit sworn out by federal agents, Mr. Madoff himself said the fraud had totaled approximately $50 billion, a figure that would dwarf any previous financial fraud.

At first, the figure seemed impossibly large. But as the reports of losses mounted on Friday, the $50 billion figure looked increasingly plausible. One hedge fund advisory firm alone, Fairfield Greenwich Group, said on Friday that its clients had invested $7.5 billion with Mr. Madoff.

Mere her, HT: Tyler Cowen.