MasterCard Gets a Rude Jolt

Shares plunged Friday aftet the credit-card outfit warned of margin pressure

After MasterCard (MA on Feb. 9 announced a profit and rising numbers of transactions during the three months ended Dec. 31, the Purchase (N.Y.) company's stock price hit a new 52-week high. But it soon plummeted more than 11% as investors worried about the credit card company's ability to keep profits growing in 2007.

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