AT&T; HAS DONE IT FOR YEARS. GENERAL ELECTRIC began doing it two weeks ago. Now General Motors is offering its own high-powered credit card to boost sales of its products and grab a share of the $485 billion market for plastic money. The auto giant said holders of its new GM MasterCard would earn 5% rebates on purchases made with the card, up to a maximum of $500 a year or $3,500 over seven years. Card-holders could apply the rebates toward the lease or purchase of new GM cars and trucks -- except for the hot-selling Saturn, which has never offered...
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