(The opinions expressed here are those of the author, a columnist for Reuters.)

By James Saft

(Reuters) – If the United States does more than flirt with a government shutdown and technical default, old assumptions about the safe-haven status of Treasury debt and the dollar will face unprecedented threats.

Congress, which returns from recess on Tuesday, has until mid-September to pass a budget measure, one which the president is willing to sign. If not, absent a veto override, the government will be forced to shut down, probably in early October.

At the same time, the Tre…
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