NEW YORK--(BUSINESS WIRE)--U.S. companies significantly increase their engagement in exporting as firm revenue grows and businesses mature, according to the Middle Market Power Index: Taking the Global Stage from American Express (NYSE: AXP) and Dun & Bradstreet (NYSE: DNB). This second in the series of reports, analyzing Dun & Bradstreet’s proprietary database of more than 19 million commercially-active1 U.S. firms, explores the characteristics of U.S. middle market companies (defined


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