The End of the Credit Card? (Farhad Manjoo/Slate)

Farhad Manjoo / Slate:
The End of the Credit Card?  —  A new app called Card Case foretells a world without cash and plastic.  —  Jack Dorsey, creator of Twitter and CEO of Square  —  Getty Images.  —  Paying for stuff with your phone sounds awesome until you stop to think about it.

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