By The Economist
What is a central banker’s main job? Ask the man on the street and the chances are he will say something like “keeping a lid on inflation”. In popular perception, and in their own minds, central bankers are the technicians who squeezed high inflation out of the rich world’s economies in the 1980s; whose credibility is based on keeping it down; and who must therefore always be on guard lest prices start to soar. Yet this view is dangerously outdated. The biggest problem facing the rich world’s central banks today is that inflation is too low.