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The only problem is that there is not enough gold and silver in the world to mint coins with them...

I think the amount of silver is enough.
that is because of the cost of making a silver coin, still below the maximum amount Banknotes .
The reason why the country does not use silver coins, that is because the banknotes are profitable,
When the country issues silver coins, the face value of silver coins is its several times the value,
In ancient times, the face value and its value of silver coins were about 70%.

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