Earlier quoted context omitted.
I don't think deflation is the natural state of things. Even before fiat currency the money supply grew (e.g. gold mines) and we had inflation. Productivity growth is normal-ish, but the amount you prices have been all over the place throughout history.
Gold mines were not the major cause of inflation during the pre-fiat era. It was almost always deducting the precious metal content of the accepted currency, often to fund things like war. Deflation should be the natural order of things; for example the unit real cost of food had gone down massively since the first half of the 20th century, which is a huge part of why people don't starve to death during recessions an…
Yes, and it is, for existing unchanging things. But as productivity grows we invent and buy new and improved things.