eli5: Why does it seem like every civilisation uses coins as currency even before there was a lot of mingling?

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I just saw a photo of old coins from like 1 or 2000 years ago and they are all round.
Why is it that they all use coins and not squares or something else completely?

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6 Answers

Anonymous 0 Comments

A round shape is easy to make, replicate, and deal with.  Something others here haven’t gotten into is the divicibility. A big thing with currency is the ability to divide it. Having a round shaped coin makes it very easy.  

 Half a coin cut it in two, 

A quarter cut the half coin in two 

A piece of eight cut the quarter in half 

 Using square coin would make this process more complicated, and make it easier for people to scam you.

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