Why did people needed a different unit of account such as the dollar or sterling, instead of just using weight units such as grams? @GeorgeSelgin @lawrencehwhite1
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Maybe something related to divisibility? It seems less appealing to create one such unit if they used shells. Why would you create a unit called shells2 equivalent to 1.5 shells?
It was the quantity by weight of metal that was the money. The form of the metal was for transactional convenience and sometimes for display. Some pieces of jewelry were, like later coins, of standard weight, others could be cut in arbitrary places and weighed.
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Shells OTOH were typically counted and valued by size. Each size range had a different secure supply curve effectively forming a different denomination. The Yurok had ruler-like tattoos for measuring the length of their dentalia shells. https://unenumerated.blogspot.com/2017/02/conflict-and-collectibles-among-yurok_87.html …pic.twitter.com/Qy1JSAIxnx
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Shells > USD?
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Alas, cheap transportation and industrial era tools greatly inflated them and often made counterfeiting easy. Validation lore wasn't up to that challenge; secure validation became too expensive.
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What I got from all this then is that monetary units emerged from the fact that optimal convenience in size and shape for transaction and storing purposes was not aligned with standard weigh scale.
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