nations can create their own currencies and produce these currencies in places such as mints and present them to the market. (For example, coal will be traded, but if this is done in rubles, the value of the ruble against the dollar will increase compared to the amount) I think that these currencies can be converted with a command like /currency. (For example, if there is 1000 euro in the market, if there is 1 million euro in the market, its value should be low according to the amount of production of the money), I mean that the currencies of the countries that print more money become worthless.