Will retailers like Saks Fifth Avenue and Bloomingdale|s start handing MasterCard and Visa cards to their customers? That's the latest buzz - and it could cause the biggest shift in credit card market share since AT & T jumped into the business two years ago.

Most "private label" cards are used at a specific merchant. But if a retailer issues ins plastic through a Visa or MasterCard member bank, the cards could be used just about everywhere.

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