Wells Fargo Bank has introduced a credit card that rewards small- business owners with air miles for making purchases on the card. But there is some question whether the benefits outweigh the costs.

Employees using the BusinessMiles MasterCard will earn points for round- trip travel on most commercial flights in the United States, Canada, Mexico, and the Caribbean, Wells Fargo said. One account will be used to track all the miles earned by each card issued to a particular business.

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