This is only the case if you have full reserve banking.
Under gold-backed fractional reserve there is no requirement that there be enough gold to back all the notes in circulation promising gold.
There are certainly problems with fractional reserve banking but gold backing is not a fundamental weak point here. Even IRL if everyone demands real dollar notes there is not enough in the banks and the FDIC reserves to pay it all out on demand if everyone recalled their deposits, they could not even run the money printer fast enough to cover it.
Yet somehow world trade still goes on, despite there being more value of goods in trade than currency than can back it.
Side note for completeness: theoretically all trade of any size happen with even a single gold coin by increasing velocity of money.
What happens when foreign buyers want to withdraw gold and not hold "money" in an account?
Internally, gold-backed fractional reserve sounds reasonable.
Panics and crisises aren't automatically a bad thing. If people are doing something wildly stupid they need to stop and undertake alternative activities. Something has to make them do that; if it is a panic then that is better than persisting with stupidity. Besides, the US still has regular crisises. There is one every 10 years or so. They just don't see as much upside between them as they used to.
> The shortages powered William Jennings Bryan to the Democratic presidential nomination after his "Cross of Gold" speech.
If Trump says something does that automatically make it true in 100 years? No. Politicians aren't automatically right and neither are voters. People get stuff wrong in policy all the time. Popularity and truth are different.
And Wikipedia suggests that most people disagreed with him regardless, he lost the election and the US proceeded to adopt a gold standard. Which still doesn't tell us much about its policy merits I might add.
My point about Bryan is that the gold standard was causing so much pain that he rode his solution to the nomination. That his solution (bimetallism) was terrible helps explain his loss.
It isn't like getting rid of the gold standard has helped the US grow, since then we've have seen them mean regress from being an unchallengeable global colossus to arguably the #2 economy. The government printing money at will and handing it out to asset owners who by rights should be going broke is a component of that.
If you'd like a computer metaphor, possibly think a program unexpectedly spitting out a stacktrace. The stacktrace is not, in and of itself, the problem. The problem is the thing causing the stacktrace and the stacktrace is actually helpful for diagnosing. In the case of economies, panics don't draw attention to the problem but actually fix it directly.
> ...that he rode his solution to the nomination
A lot of nominees around that time thought the gold standard was a good idea, which doesn't prove anything either. The opinions of nominees more than a century ago aren't really evidence. It is an appeal to authority except he wasn't an authority in any meaningful way. He didn't know much about economics and turned out not to represent the consensus of ordinary citizens either.
The US has not actually put leaving the gold standard to a vote as far as I know. In fact I don't think the current situation is a result of big deliberations, at Bretton Woods people thought they were agreeing to a gold standard and as the US's economy is eclipsed we might easily see a rethink of the global trade system where it comes back.
It makes intuitive sense that the gold standard would have limited economic activity, but did it actually do? If the gold standard had been constricting economic activity, one would expect GDP growth to have accelerated after the gold standard was eliminated, but as far as I can tell that didn't happen.