Comment by AnthonyMouse

> what if the US would use actual physical gold coins instead of dollars?

The problem here is, what if the demand for dollars increases?

In principle the US would get more gold and mint more currency, but gold is a finite resource. "All the gold ever mined" is around 200,000 metric tons, ~32k troy ounces per metric ton is ~6.4B troy ounces.

In 2022 (just before the recent gold rally) the price was ~$2000 per troy ounce, i.e. "all the gold" was worth ~$13T. Meanwhile the M3 money supply in the same year was ~$20T. What happens if you try to buy $20T worth of gold to mint currency when only $13T worth has ever been mined, and not all of that is even on the market? The answer is that you can't, so instead the result is deflation, which is bad.

Or to put it a different way, what do you think the economic effect of the recent gold rally would be for a country whose currency was still pegged to gold? It just got way cheaper to import foreign products than buy domestic ones, and way more expensive for foreign countries to buy your exports, so how's the unemployment rate looking? The amount everyone owes on their mortgage hasn't changed but the nominal value of their houses just got cut in half so now they've lost their jobs and are underwater. What happens when they start to default and foreclosures don't allow the banks to recover the principal?