The amount of money in circulation continues to increase will cause inflation in a country, this will have an impact on prices which will also continue to rise. If the amount of money in circulation doubles, prices will also double. An increase in the amount of money in circulation can occur, for example, if the government uses a deficit budget system.
IMO, Fiat is monopoly money, going back and forth is also wrong. The higher the interest rate, the greater the inflation and if the interest rate is lowered, the inflation will remain the same, but the effect will be different. because it is the monopoly nature that refers to the fact that only the government has the authority to print or issue such fiat.
Because Inflation is a complex economic phenomenon that is influenced by many factors as well, including monetary policy, fiscal policy, demand and supply and external factors such as commodity prices. Inflation can also be affected by global events, such as fluctuations in world oil prices or changes in international trade policies. So, inflation occurs all over the world because there are factors that are interrelated and vary in each country. That's why inflation occurs all at once throughout the world.