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The US had an official dual currency from 1914 to 1933. There were gold dollars, and fiat (inflated) dollars. There was an official, fixed exchange rate between the two. The two started out at parity in 1914, but things diverged steadily until in 1929 a gold dollar was worth 85% more than a fiat dollar.

Like all such systems where the relative values float but there's an official exchange rate, this eventually collapses with runs on the banks, as people try to profit by buying the higher valued currency at the discount guaranteed by the exchange rate.

This persisted until Roosevelt suspended all those exchanges. Then we had a fiction of a gold exchange rate until Nixon finally dispensed with it.

We have a dual currency today - when you pay a "convenience fee" for using a credit card instead of check or cash, that's what is going on (as the credit card taker gets charged 3% for those transactions, and passes it on to the credit card user).



> We have a dual currency today - when you pay a "convenience fee" for using a credit card instead of check or cash, that's what is going on (as the credit card taker gets charged 3% for those transactions, and passes it on to the credit card user).

Barring a few gas stations that give a cash discount, that's very much not the way it works. It's the cash users getting screwed; they pay the same price as credit card users, but they don't get the rewards you'd get as a credit card user (I get 2-5% cash back on virtually any purchase, for example).


Oh, many times I've seen the same price for cash or credit, asked for a "discount for cash", and got it.

The times they won't give a discount, I pay with the credit card and get the "cash back".

The proprietor, though, will nearly always give a discount for cash, because it's money ahead for him.


That may be an attribution error.

https://www.thisamericanlife.org/515/good-guys

> Producer Ben Calhoun tells Ira about a secret move his friend uses all the time — the "good guy discount" — that gets Ben's friend money off all sorts of items when he's shopping. (6 minutes)

More often than not, if you ask someone with the power to give one for a discount - for any polite reason - there's a decent chance they'll do it.


You might be right. A cash discount should be 1-3%. But I've often gotten 10% off just by asking. Even at department stores like Macy's.


The name for this effect where people try to hoard the more valuable currency is Gresham's law: https://en.wikipedia.org/wiki/Gresham%27s_law




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