Earlier quoted context omitted.
This is a specious (ha!) argument because the total amount of effort required to safeguard precious metals is so small, because the metals themselves are so small. Gold currently costs US$55.92 per gram. Gross world product is US$80 trillion per year over 7.9 billion people; this works out to US$10.1k per person per year, or US$770k per person per 76-year lifetime. The lifetime earnings of an average person are thus…
First you can most of the benefits of gold as a currency by just buying gold and then selling it in 40 years. At a personal level a gold backed currency doesn’t change much. Anyway, if gold was actually the words medium of exchange it’s value would be vastly higher. A reasonable estimate is the value of the worlds gold would equal the value of the words current money. As it’s a nice round number the US’s 20 Trillion…
There's nothing in the use of commodity money rather than fiat money that prevents fractional-reserve banking, though you seem to be suggesting that there is, since you're doing the computation based on M1 (though I think you may be using the number for M2). The St. Louis Fed estimates the velocity of M1 and M2 at 1.122, which I guess is transactions per year: https://fred.stlouisfed.org/series/M2V so I think you're probably right that gold would be about 5 or 10 times as expensive without fractional-reserve banking.
So instead of 700 grams of gold your lifetime earnings would be 70 grams.
If 5% instead of 0.5% of the cost of electronics was gold, I don't think you'd be able to tell the difference. Maybe that boosts the economic impact of this return to the gold standard to the same as spelling both "through" as "thru" and "thorough" as "thoro".
Your implied prohibition on fractional-reserve banking would, by contrast, have an enormous economic impact.