Two reasons. First, the people who make monetary policy don’t just get to pick inflation. They “target” it, and sometimes that targeting doesn’t work. If target inflation is 0, then sometimes you get deflation, which can be quite damaging to the economy because it strongly discourages spending.
Second, a target of 0 inflation would require quite strict monetary policy. Fighting this recent bout of inflation has required restrictions that make it harder for people to borrow money -not just businesses and banks but also home buyers and other individual borrowers. Targeting zero inflation would crank this up even higher and make it permanent.
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