Nice 101 ancient historical reasons but next time you go overseas stow a few ounces in your wallet, and if you get through Customs at the other end without doing jail time try slicing off a few ounces here and there to pay for your hotels and restaurants.
Gold is an illiquid, semi-useless soft metal that's nice to look at but not much use for anything else and as technology progresses it becomes even more useless.
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