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'Once-in-3-Billion-Year' Jump in Bonds Was a Warning Shot, Dimon Says

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Dimon Says JPMorgan Stress Tests for Grexit

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JPMorgan Chase & Co. head Jamie Dimon said last year’s volatility in U.S. Treasuries is a “warning shot” to investors and that the next financial crisis could be exacerbated by a shortage of the securities.

The Oct. 15 gyration, when Treasury yields fluctuated by almost 0.4 percentage point, was an “unprecedented move” that would have serious consequences in a stressed environment, Dimon, the New York-based bank’s chairman and chief executive officer, said in a letter Wednesday to shareholders. Treasuries are supposed to be among the most stable securities.