As the middle market matures, private equity investors and strategic buyers are increasingly seeking deal sources beyond the borders of the U.S.

The BRIC nations of Brazil, Russia, India and China certainly continue to provide opportunities, but lesser-known, faster-growing countries from Bangladesh to Vietnam are also beginning to entice investors drawn by the future purchasing power of rising middle classes. As a result, the value of global M&A investments that targeted the world's key growth markets surged by 5 percent in 2012, compared with the previous year, to more than $162 billion, according to law firm Freshfields Bruckhaus Deringer.

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