Amid all the junk mail pouring into your house in recent months, you might have noticed a solicitation or two for a "professional card," otherwise known as a small-business or corporate credit card.
If so, watch out. While Capital One Financial Corp.'s World MasterCard, Citigroup Inc.'s Citibank CitiBusiness/AAdvantage Mastercard and the others might look like typical plastic, they are anything but.
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