The typical indexes are based on the buying power of everyday items.. so yea food is a way better measure. But it still pegs the value to the location it is in and not an absolute thing.
Precious metals is just as bad a peg off value as anything else. Precious metals have real world use that cause their values to swing, often, even more so than fiat itself.
@anon00110
I'd be equally willing to take rubles and US dollar for my gold, since I would immediately (before either had a chance to crash) use that money to invest in things.
I think the key in understand value of classical fiat is to understand that it is basically an IOU from the government. Its value is derived from the credibility of the government and its people. Its buying power is effectively directly linked to the GNP. This is why crypto is so unique, its the first money we have that isnt linked to a specific group of static people.
one tradition is pegging everything by kilograms of gold, but the way people actually use money is to buy food and rent.