Paper or Plastic: Cash Is Dead
I just got back from a ten day trip to the USA in which I ran a bit of an experiment: I never carried a single dollar or cent of US currency on my person. All my transactions were electronic using a debit card, even the extremely cheap ones like buying a $0.99 bottle of water from a convenience store. None of the cashiers even batted an eye when I pulled out the plastic for such a tiny purchase. In Spain, I suspect they would refuse your business if you tried to pull a stunt like that.
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