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The technical definition of inflation is raising prices. It's only a strictly monetary phenomenon if output and velocity are fixed with respect to the money supply. In other words, inflation meaning "more money" is only a technical definition in the kooky world of monetarism.

So if bought inflation-protected securities from the us treasury, they would have paid >300% from 2008 to now? Or does the us treasury use the journalist definition of inflation?

Economic definitions are abstractions built for mathematical tractibility while creating formal models.