Inflationism is a heterodox economic, fiscal, or monetary policy, that predicts that a substantial level of inflation is harmless, desirable or even advantageous. Similarly, inflationist economists advocate for an inflationist policy.
Mainstream economics holds that inflation is a necessary evil, and advocates a low, stable level of inflation, and thus is largely opposed to inflationist policies – some inflation is necessary, but inflation beyond a low level is not desirable. However, deflation is often seen as a worse or equal danger, particularly within Keynesian economics, as well as Monetarist economics and in the theory of debt deflation.
Inflationism is not accepted within the economics community, and is often conflated with Modern Monetary Theory, which uses similar arguments, especially in relation to chartalism.