When government intervention makes currency worthless, this condition is called

deflation.

hyperinflation.

cost-push inflation.

demand-pull inflation.

In economics, hyperinflation occurs when a country experiences very high and usually accelerating rates of inflation, rapidly eroding the real value of the local currency, and causing the population to minimize their holdings of local money. Hyperinflation is a situation where the price increases are so out of control that the concept of inflation is meaningless.