Financial markets are showing signs that they are starting to take seriously the possibility that the U.S. government will default on debt this week. Fitch Ratings said it could strip the U.S. of its AAA credit rating if the standoff over the debt limit lasts much longer. Interest rates rose on a long list of government debt. Citigroup sold off holdings of short-term Treasury bills, following similar action by Fidelity and JPMorgan Chase.

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