Bernanke said the Fed could start reducing bond buying "in the next few meetings" but warned against premature action, amid conflicting messages that roiled markets.
Ghana hopes to become the latest African country to ride the wave of cheap borrowing with the sale of a new bond aimed at international markets for only the second time in its history.
Copper prices settled near six-week highs but pulled back from earlier peaks, as worries about the future of the Fed's monetary stimulus tempered suggestions of tighter supplies.
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