Rate Ripple

Rate Ripple: monetary policy, interest rates and the central bank for Edexcel IGCSE Economics

This free game is part of our Pearson Edexcel IGCSE Economics (4EC1) course for exams in EXAM YEARS 2027-2030.

Be the central bank

Rate Ripple is a free 3D game about monetary policy for Pearson Edexcel International GCSE Economics (4EC1). It covers specification point 2.1.2 (b): the definition of monetary policy, the definition of interest rates, the central bank’s role in setting interest rates, the impact of changes in interest rates on the macroeconomic objectives, the mechanism by which a change in interest rates affects consumers and businesses, and awareness of asset purchasing used by central banks.

You are the new Governor of the Bank of Brelan, the country’s central bank, and you have one big tool: the base rate. Monetary policy is policy that uses changes in interest rates to influence the economy, and an interest rate is the cost of borrowing money and the reward for saving it, shown as a percentage. Kofi, the bank’s chief economist, explains each new idea on a video call as you play.

Watch the ripple spread

Every time you raise or cut the base rate, a ring ripples out across the high street from the central bank’s steps, and each building reacts as it arrives. Northgate Bank’s board flips, because high street banks follow the base rate: its loan rate and its savings rate move the same way. Anya’s mortgage changes: on a 100,000 pound mortgage, 3% is 250 pounds a month in interest and 5% is about 417, so bigger payments leave her less to spend. The Brelan Bikes factory’s new wing speeds up or stops, because firms borrow to pay for investment. A few months later the crowds change too: fewer or more shoppers, more or fewer savers walking into the bank, the queue at the job centre growing or shrinking, and the price tags in the shop windows rising faster or slower.

This is the hard part to see in a textbook: the chain from one decision to prices and jobs, and the fact that it takes time. A rise in the base rate makes borrowing more expensive and saving pay more, so consumers spend less and firms invest less, total demand falls, and demand-pull pressure on prices eases. A cut does the opposite.

Three rounds of steering the economy

In Too hot, a spending boom pushes inflation above 4%. You raise the base rate one step at a time and learn to hold steady once inflation turns down, because the effects arrive months later. Then you build the exam chain link by link. In Too cold, a world slump empties the shops and lengthens the job centre queue, so you cut the base rate to speed the economy up. A phone call from the Finance Minister shows why it is the central bank, not the government, that sets the base rate, and a housing boom shows how the objectives can pull in different directions. In Storm season, an export boom, a government tax cut (fiscal policy, not monetary policy) and a banking crash hit one after another. When the rate is already as low as it can go and the economy is still weak, you use asset purchasing: the central bank creates new money and uses it to buy assets such as government bonds, keeping borrowing cheap.

A live panel tracks inflation against the green target band, plus economic growth and unemployment. Every quarter with inflation on target scores points. A wrong-way move is cancelled and explained properly, so you learn the reasoning, not just the answer.

Exam tips the game drills

• Monetary policy changes interest rates. Fiscal policy changes taxes and government spending. Don’t mix them up.
• The base rate is set by the central bank (the Bank of England in the UK), not the government.
• For an ‘analyse’ question, write the whole chain: interest rate change, then borrowing and saving, then spending and investment, then total demand, then the objective (inflation, growth or unemployment).
• Higher interest rates make borrowing less attractive, not more.
• Choices can pull in different directions: a rise can bring inflation down but slow growth and cost jobs.