What do you say to the people who say cryptos have no real value?

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Niether does your credit card: it's just a piece of plastic. But, businesses will let you walk out with their goods once they think they have your electronic Dollars in their bank account.

It's a system of electronic exchange - much like the credit/debit card you use every day, right now. The main difference is that a bank has issued the credit card you are currently using, but cryptos are kept track of by block producers on a decentralized network. It's actually better, because cryptos replace the functions of banks, without having to pay for all of the overhead of real-estate, wages, and employee pensions.