Citigroup Inc. launched a credit card for business owners that allows users to earn rewards across their business and personal spending.

Many banks already blur the line between consumer and small-business products, since micro-merchants tend to think and spend like consumers. Small-business owners also sometimes also blend their personal and business finances.

The New York banking company's new CitiBusiness ThankYou card is meant to serve such customers by providing added rewards to people whose banking relationship spans both their work and home life.

Rewards earned on the CitiBusiness ThankYou card can be combined with rewards earned on other bank accounts, including consumer ones. The business card provides extra reward points for spending in categories such as office supplies, computer equipment, hotels and car rentals.

"This new card gives business owners more ways to earn ThankYou points and the flexibility to redeem for what they want," said Terry O'Neil, the managing director and head of proprietary products for Citi Cards, in a press release June 20.

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