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Monetary policy

Monetary policy is how a central bank influences the economy — mainly by moving a short-term interest rate to keep inflation stable and employment healthy.

The policy rate

The central bank sets a target for a key short-term interest rate. Raising it makes borrowing more expensive and saving more attractive; lowering it does the reverse. This one lever ripples outward to mortgages, business loans and the rates banks charge each other.

How it transmits

A rate change works through spending. Cut rates and borrowing rises, businesses invest, households spend, demand climbs — supporting jobs but, if pushed too far, stoking inflation. Raise rates and the opposite happens: demand cools and inflation eases, at the cost of slower growth and, sometimes, higher unemployment. The effect arrives with a lag of many months, which makes timing hard.

The dual mandate tension

Many central banks are asked to pursue both stable prices and maximum employment. In the short run these can conflict: fighting inflation may require cooling the economy and raising unemployment, while boosting jobs can add to inflation. Managing that trade-off in real time — with incomplete data and long lags — is the core challenge of the job.

Other tools

Beyond the policy rate, central banks use open market operations (buying and selling government bonds), reserve and lending facilities, and forward guidance — communicating future intentions to shape expectations today.

Common exam traps

• Confusing monetary policy (central bank, interest rates) with fiscal policy (government, taxes and spending).
• Forgetting the long and variable lags before a rate change bites.
• Assuming lower rates always help — they can overheat an economy near capacity.

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