Stability is a feature of industrial processes. Natural processes are all over the place. Also, there are external shocks that you can't control (e.g. oil producers raising prices in the 70s, Russia invading Ukraine, etc.).
Compare pre and post 1945. The 1800s had a depression every banking cycle, now we just get recessions. Bank failures no longer take down your life savings. The king of England doesn't sometimes surreptitiously start putting copper in the gold coins to fund wars any more (e.g. inflation). GP's chart is pretty impressive, actually. Aside from the 70s oil shock, inflation is pretty constant, especially in the last couple decades.
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