Analysis: JPMorgan dips into cookie jar to offset London Whale losses

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"They really made two stupid decisions," said Lynn Turner, a consultant and former chief accountant of the Securities and Exchange Commission. The first was taking risks with derivatives that they did not understand, Turner said.

"The second is selling assets with high income that they can't replace," Turner added. In a low interest-rate environment, the bank will struggle to generate as much income with the cash it received from selling the securities, he said.