This month's banking consolidation, involving several of the industry's biggest players, is likely to alter the debit processing landscape.

Citigroup Inc. announced Monday it would buy Wachovia Corp.'s banking operations, just days after JPMorgan Chase & Co. purchased Washington Mutual Inc.'s banking arm. The deals could continue to shift the balance of power between MasterCard Inc. and Visa Inc. and offers MasterCard an opportunity to regain some of the ground it has recently lost to its rival.

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