Monetary Policy
How central banks manage money supply, interest rates, and credit conditions to pursue price stability and employment goals.
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Monetary policy is the set of actions by which a central bank — such as the Federal Reserve, the European Central Bank, or a national bank — influences the cost and availability of money and credit in the economy. Its typical goals are price stability (low and stable inflation), maximum sustainable employment, and moderate long-term interest rates. Central banks pursue these by steering short-term interest rates, which ripple through the whole financial system.
The main instruments are conventional and unconventional. Open market operations — buying or selling government securities — are the everyday tool: buying injects reserves into banks, pushing short-term rates down; selling withdraws them, pushing rates up. The policy rate (the rate banks charge each other for overnight reserves) is the headline number that central banks set. Reserve requirements and the discount rate are older, blunter tools. When rates are already near zero, central banks may use forward guidance and quantitative easing — large-scale purchases of longer-dated securities to lower long-term yields directly.
Transmission works through several channels: lower policy rates reduce borrowing costs for households and firms, raise asset prices, weaken the exchange rate, and encourage risk-taking and spending. These channels take months to propagate through the economy, which is why policy is forward-looking: central banks react to forecasts, not just current data. Raising rates cools demand and reduces inflationary pressure; cutting rates stimulates spending. The classic trade-off is captured by the Phillips curve — lower unemployment tends to accompany higher inflation in the short run, though expectations matter greatly.
Inflation targeting — announcing a numerical inflation objective (commonly about 2%) and adjusting policy to hit it — became the dominant framework in the 1990s. Central bank independence is considered important because governments with printing presses face temptation to inflate away debt. Policy credibility anchors expectations: if the public believes inflation will stay low, wage and price setting keeps it low. Monetary policy interacts constantly with fiscal policy, and its limits include the zero lower bound on interest rates and the risk that rapid tightening triggers recessions.
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central banks interest rates macroeconomics monetary policy