system
Given the following post, respond as if you're commenting on Reddit:
human
Why do governments aim for a 2% inflation target?

Most governments(or central banks) of developed economies aim for a 2% inflation target. Why don't they have their inflation target at 0%? I was thinking for the central bank to increase aggregate demand just enough by printing money to meet the increase in long-run aggregate supply. This leads to economic growth, but no inflation.
gpt
Positive inflation rate enables central bank to provide stronger stimulus during a downturn. There is a lower bound for nominal interest rates at (or slightly below) zero. It means that real interest rate (nominal interest rate minus inflation rate) cannot go negative when inflation is at zero. In contrast, when inflation rate is positive, central bank can make real interest rate negative to stimulate consumption and investment further.