Citibank, which has traditionally catered to large corporations rather than to mom-and-pop stores, is ramping up services for small-business customers, a strategy it hopes will help it win customers from the market leader, American Express Co.

The Citigroup Inc. subsidiary on Monday took the wraps off a product that may become a key weapon in this fight: CitiBusiness Platinum Select MasterCard, the first Citi-branded credit card meant for small businesses. Companies that sign up for the card gain access to a Citibank team of "experts," who can answer questions ranging from how to build a Web site to how to set up an employee benefits program.

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