5.3 Monetary Policy

2026 📋 Syllabus Objectives

By the end of these notes, you should be able to:

  1. Define monetary policy
  2. Identify and explain the tools of monetary policy: interest rates, money supply, and credit regulations
  3. Distinguish between expansionary and contractionary monetary policy
  4. Use AD/AS diagrams to analyse the impact of both types of monetary policy on national income, real output, price level, and employment

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Objective 1: Definition of Monetary Policy

Monetary policy is a type of government policy where the authorities (usually the central bank, such as the Bank of England or the Federal Reserve) try to influence the economy by controlling money-related factors — specifically the money supply, interest rates, and credit regulations (how easily people can borrow money).

In simple terms: monetary policy is about using money and borrowing conditions as tools to steer the economy in a desired direction.

The main goal of monetary policy is to influence Aggregate Demand (AD) — which is the total amount of spending in the economy at any given time. By changing how much money is available and how expensive it is to borrow, the government can encourage or discourage spending, which affects the whole economy.

Think of it this way: If the government wants people to spend more, it can make borrowing cheaper. If it wants people to spend less (to cool down rising prices), it can make borrowing more expensive.

Objective 2: Tools of Monetary Policy

There are three main tools the government or central bank uses in monetary policy:

Tool 1: Interest Rates

Interest rate is the cost of borrowing money — it is the percentage that a borrower has to pay back on top of the amount they borrowed.

  • If you borrow 1,000 dollars at an interest rate of 5%, you must pay back 1,050 dollars in total.
  • Interest rates are set or influenced by the central bank.

How it works:

  • Lower interest rates → borrowing becomes cheaper → people and businesses borrow more → they spend and invest more → AD rises
  • Higher interest rates → borrowing becomes more expensive → people and businesses borrow less → they spend and invest less → AD falls

Interest rates also affect savings. When interest rates are high, people earn more from saving, so they are more likely to save rather than spend. When rates are low, saving is less rewarding, so people tend to spend more instead.

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