Zimbabwean farmers sit on bags of tobacco leaves, mostly for export, at Tobacco Sales Floor Ltd. in Harare in this May 7, 2009 file photo. A fresh U.S. trade pact could provide relief to African economies buffeted by the commodities slump but a failure to reform during the boom years has left many countries unable to profit from tariff-free access to the world's largest market. (Photo by Philimon Bulawayo/Reuters)
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