After the market close on December 15th, shares of Visa [ V 78.70 -1.07 (-1.34%) ] began selling off with a ferocity not seen since the recession. In two days, the payment-processing giant’s stock tumbled more than 17%. Shares of MasterCard [ MA 274.50 -7.89 (-2.79%) ] weakened 13% during the same time period.
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