A woman selling tamales tastes one of your chocolate candies. "This is very high-quality chocolate," she says. "I will take it as payment for a tamale. Here is your change - 100 cacao beans."

You're in luck! The ancient Aztecs used cacao beans, which are the source of chocolate, as money. The Aztecs started off trading cacao for its own value and turned it into money - something they could use to buy other things.

It just goes to show you that any object can serve as money if everyone agrees to it.