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Why do we have coins and paper bills?

Money's Big Trick
Why do we have coins and paper bills?
You've got coins jingling in your pocket and a few crumpled bills in your wallet. ~~But why these?~~ Why not **seashells

You've got coins jingling in your pocket and a few crumpled bills in your wallet. But why these? Why not seashells or chocolate bars or signed promises on napkins?

Long ago, people traded stuff directly. You'd swap three chickens for a basket of grain. But what if the grain farmer didn't want chickens that day? You'd be stuck holding poultry.

How was this book?