The guest on this week's nationally syndicated Motley Fool Money radio show is David Wolman, author of the new book The End of Money: Counterfeiters, Preachers, Techies, Dreamers -- and the Coming Cashless Society. In this audio segment, Wolman analyzes how financial companies such as Bank of America, Citigroup, and New York Community Bancorp have a big opportunity as mobile payments become increasingly more vital to the global economy.

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