Monetary policy

The use, normally by the central bank, of interest rates and other tools to try to influence the economy. Interest rates are raised when the bank is trying to control inflation and lowered when inflation is low and it is trying to revive the economy. The financial crisis of 2007-09 led central banks to face the zero lower bound. This prompted many of them to use a new tool, quantitative easing, which was designed to bring down long-term rates or bond yields.