[alinaerin]

How one country know the other country currency worth or other country central bank reserve moreover how they know that other country is printing more money !

[paraclete]

curriency values are set in markets or by central banks in reference to a base currency.

The supply of currency in an economy isn't the issue but the backing for that currency held in government reserves. Governments don't secretly print more money but they may borrow from other countries increasing the money supply