The $528 million acquisition of fourth-largest rating agency Duff & Phelps Credit Rating Co. by third-largest Fitch IBCA has sparked speculation on what impact the newly merged company will have on its two top rivals.

While one waggish market analyst called the merger "also meets ran," a solid number of Street players on both sides of the Atlantic argued that the new rating agency could take a bite out of Moody's Investors Service's and Standard & Poor's Ratings Group's market share, especially overseas.

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