Small-business owners' confidence in the economy fell in March to its lowest level in more than a year, according to data from Discover Financial Services.

The Riverwoods, Ill., credit card company's Small Business Watch index fell to 75.7 in March, down 9.2 points from February. The index reached 71.9 in February of last year. It was pegged at 100 when it was created in 2006. The latest data was released Monday.

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