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.