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So interesting...
Imagine you have a little flake of 0.04 grams but the coffee you want to buy is only 0.01 gram. How do they deal with that? Cut it up? Or just buy a few more things till the goods equal the weight?
Probably just like in a regular store - they only sell things in packages that make sense.
I can also imagine the grocery store having some kind of credit system - like you deposit X grams of gold to them, and then draw down from that deposit.
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