Citigroup's (NYSE:C) consumer banking growth has been so lackluster lately that a credit card deal with electronics retailer Best Buy (BBY) turned out to be one of the brightest spots in its third-quarter results.

The country's third-largest bank on Tuesday reported quarterly earnings that fell short of estimates as bond-trading revenue slumped and its mortgages business suffered from an industrywide slowdown in refinancing activity. Chief Executive Michael Corbat said he was not satisfied with the results and told analysts that, absent meaningful revenue growth, Citi would look to improve its performance by further cutting costs and counting on in technology that could improve its efficiency.

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