Modern central banks deliberately aim to maintain some inflation in their monetary policy.
(Moderate) inflation is generally thought to be a net positive because it discourages hoarding money and encourages investment and consumption, which is usually good for economic growth.
Also, even modest levels of deflation can turn into a vicious cycle, so if you don’t want to risk falling into a deflationary spiral, you need to maintain some inflation, because perfect price stability simply isn’t possible.
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