JOHANNESBURG (Reuters) - South Africa's rand weakened against the dollar on Friday with global risk appetite turning negative as negotiations on measures to avoid a recession in the United States stalled. The currency was down 0.74 percent at 8.5375 at 0712 GMT after ending Thursday's New York session at 8.4750. The rand tracked the euro, which fell against the dollar on Friday as a deal to head off $600 billion worth of tax hikes and spending cuts that could push the U.S. economy into recession next year remained elusive. ...

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