Lessons › Fundamentals and news › Central banks and interest rates

World 7 · Fundamentals and news · lesson 8 · level 3

Central banks and interest rates

When a central bank raises interest rates, borrowing gets more expensive, which usually cools the economy and can move many markets.

In one line

When a central bank raises interest rates, borrowing gets more expensive, which usually cools the economy and can move many markets.

Explained simply

Imagine the price of borrowing money is a thermostat for the economy. Turn it up, and borrowing costs more, so people and companies spend less and the economy cools. Central banks set that thermostat, and markets watch every move.

The lesson

Central banks such as the US Federal Reserve, the Reserve Bank of India and the Bank of Japan set short-term interest rates to manage inflation and growth. Higher rates tend to support a currency and weigh on bond prices and on stocks valued for distant growth, while lower rates tend to do the opposite. Markets move most on surprises and on hints about future decisions. These are tendencies, not rules, and markets sometimes do the opposite.

A worked example

Illustrative example: a company borrows 1,000,000. At a 5% rate its yearly interest is 50,000 (1,000,000 times 0.05); after a rise to 6% it pays 60,000 (1,000,000 times 0.06), which is 10,000 more (60,000 minus 50,000). Across a whole economy, bigger interest bills like this leave less money for spending and investing, which is how higher rates cool growth.

The same idea at four levels

1. Beginner. Central banks set short-term interest rates, which change how expensive it is to borrow.
2. Foundation. Higher rates usually cool the economy and inflation, while lower rates usually support growth.
3. Intermediate. Higher rates tend to support a currency and weigh on bond prices and on stocks valued for distant growth.
4. Advanced. Markets react most to surprises and to hints about future moves, so the statement can matter more than the decision.
5. Expert. Experts treat every usual reaction as a tendency, plan for a jump in either direction, and check what was already expected.

Mistakes to avoid

• Treating the usual reaction as a rule; markets sometimes do the opposite.
• Ignoring the statement and hints about future moves, which can matter more than the decision itself.
• Forgetting that an expected rate change may already be in the price.

Goal of this lesson: Understand how central bank interest-rate decisions affect currencies, bonds and stocks.