Upping the ante on its rebate incentives, General Motors Corp. announced a plan to cross-sell several financial products to its credit card customers.

The move, beginning as a pilot test, is the latest ratcheting-up of nonbank competition in an area historically dominated by banks. In this case, General Motors Acceptance Corp. will be acting in tandem with Household International's credit card bank, which issues the GM MasterCard on behalf of the automaker.

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