A lot of people say inflation. But a lot of currencies are close to each other now because they started out the same.
The value of coins was the value of the metal in the coin. When countries made their own coins they made them similar to coins in other countries. Same material, weight and “value”.
Some countries made their coins different for some reason, like limited trade, lack of copper, silver or other metals.
For example if the lowest value coin was made out of iron instead of copper, the iron coin would be the “1 unit” coin.
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