Wall Street may or may not be helping Main Street but it is funneling money to another iconic address: Madison Avenue.

Some of the country's largest banks are ramping up spending on marketing after sharply scaling back advertising and other promotional expenses in the past year. According to Federal Deposit Insurance Corp. call report data, 29 of the 70 U.S. commercial banks with assets of at least $10 billion increased marketing buys in the third quarter. Those 70 spent $2.12 billion, up 10 percent from the prior quarter, though down nearly 16 percent from a year earlier, according to SNL Financial LC.

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