Governments assume they can print as much currency as they like and it will be accepted by force. However, the history of fiat currencies is always the same: first governments exceed their credit limits, then ignore all the warning signs and finally see the currency collapse.
Today, we are living the decline of developed economies’ fiat currencies in real time. The global reserve system is slowly but decisively diversifying away from a pure fiat currency anchor towards a mixed regime where gold plays the dominant role, not fiat currencies.