Hyperinflation is very high inflation, typically over 50% per month, that occurs when prices rapidly increase out of control. It can be caused by large fiscal deficits funded by increases in the money supply. To tame hyperinflation, countries must slash fiscal deficits, end central bank funding of deficits, separate central bank control from government control, and control money supply growth or exchange rates by establishing a nominal anchor for prices. Preventing hyperinflation requires dramatic interest rate hikes, reducing government spending and debt, and raising bank reserve rates, but these steps also carry economic side effects.