It's what the wallet was invented for, to carry cash. After all, there was a time when we needed cash everywhere we went, from filling stations to pay phones. Even the tooth fairy dealt only in cash.
But money isn't just physical anymore. It's not only the pennies in your piggy bank, or that raggedy dollar bill.
Money is also digital - it's zeros and ones stored in a computer, prompting some economists to predict the old-fashioned greenback may soon be a goner.
"There will be a time - I don't know when, I can't give you a date - when physical money is just going to cease to exist," said economist Robert Reich.
Economists like Reich say the demise of cash has been happening ever since our financial fortunes could first be told by a piece of plastic with a magnetic strip.
That was half a century ago - and now? "95 percent of the transactions in America, or more, have nothing to do with physical pieces of paper or coins," Reich said.
Think about it. Parking meters, taxis, tolls, even Girl Scout cookies don't require cash anymore, all proof (argue some) that cash's days are numbered.
"Everyone thinks cash is so simple and so easy and so fast and so secure. It's NONE of those things," said author David Wolman. In his new book, "The End of Money," he argues the biggest knock against cash is that it's costly.
"It's really expensive to move it, store it, secure it, inspect it, shred it, redesign it, re-supply it, and round and round we go!" Wolman said.
It already costs the U.S. government almost TWICE as much to make a penny and a nickel, than they're actually WORTH.
But that's only one cost. Wolman says cash is also the currency of crime - drug deals, bribes, and bank robberies.
And there's something else: It's not particularly clean.
"I'm right there with you," Wolman agreed. "It's pretty gross!
The filth factor alone, he says, should make cash a no-no at food establishments, like his neighborhood ice cream shop, Salt 'n Straw in Portland, Ore.
Owner Kim Malek isn't about to turn cash down - not yet anyway. But she's happier when people pay with their smart phones instead.
"It makes paying fun, which you don't hear very often," Malek laughed.
CBS
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