Inflation is inflation expectation. People (the market) starts behaving differently when they expect rising prices.

Best thing i read on the topic is how the Brazilian hyperinflation was fixed https://text.npr.org/130329523

Once you look at it from this angle most of this starts making a lot more sense. Especially post-Austerity monetary policy

edit: tldr: They invented a new theoretical currency. All prices were each month listed in the actual price in the old currency and the price in the new currency (that didnt exist yet). And each month the new currency was redefined so that stuff still cost the same in the theoretical currency. They did this for a few months till they declared inflation fixed and creating the new currency that had "proofed" its stability the previous months. And Abrakadabra, people believed and inflation was fixed through the introduction of the Brazil Real. Obvious when you think about it, its not called fiat currency for nothing.

>Say, for example, that milk costs 1 URV. On a given day, 1 URV might be worth 10 cruzeiros. A month later, milk would still cost 1 URV. But that 1 URV might be worth 20 cruzeiros.

>The idea was that people would start thinking in URVs -- and stop expecting prices to always go up.