Deep Dive: Interest Rates & Inflation

Hey {{first_name}} 👋!

Earlier this week, I put out a commercial awareness update covering the six biggest themes driving markets right now, including:

I asked you all to vote on what you wanted the next deep dive to focus on.

And the winner by quite a distance was: Interest rates and inflation. How central banks actually make decisions.

Which makes sense, because if you understand interest rates properly, a lot of finance suddenly starts making much more sense.

Why markets move. Why stocks fall. Why bonds rally. Why investment banking activity slows down. Why IPOs disappear. Why valuations change overnight.

Almost everything links back to rates in some way.

The problem is that most students only understand this stuff at surface level. They know rates go up and down, but they don’t really understand why central banks make certain decisions, what data markets are watching, or why one inflation report can suddenly move billions across global markets.

So in today’s issue, I want to properly break it down in simple terms without making it overly technical.

By the end, you should have a much clearer understanding of:

So, with that, let's get straight into it!

If there’s one thing you need to understand in markets right now, it’s this:

Almost everything comes back to interest rates.

Stock markets, bonds, mortgages, company valuations, investment banking activity, hiring, IPOs, M&A. Even when people think markets are moving because of AI, geopolitics, or earnings, underneath a lot of it is still the same core question:

What are central banks going to do with interest rates?

And the reason this matters so much is because interest rates influence the flow of money through the entire economy. When rates rise, borrowing becomes more expensive, spending slows, and growth usually cools down. When rates fall, money becomes cheaper, businesses invest more aggressively, consumers spend more, and financial markets tend to perform better.

That’s why markets react so aggressively every time inflation data comes out. Investors are constantly trying to predict what central banks like the Federal Reserve and the Bank of England are going to do next.

At the most basic level, an interest rate is simply: The cost of borrowing money.

If rates are low, borrowing is cheap. Mortgages are cheaper, business loans are cheaper, and consumers are more willing to spend.

If rates are high, the opposite happens. Monthly mortgage repayments increase, credit becomes more expensive, businesses think twice before expanding, and people generally become more cautious financially.

That sounds simple, but the impact is huge because modern economies are built on borrowing and lending. Consumers borrow to buy homes and cars. Companies borrow to grow and invest. Private equity firms borrow to finance acquisitions. Governments borrow constantly.

So when central banks change interest rates, they’re effectively changing the cost of money across the entire financial system.

The main job of central banks is to keep inflation under control.

Inflation simply means prices rising over time. A small amount of inflation is normal and healthy because it usually reflects a growing economy. But when inflation rises too quickly, it becomes a serious problem.

People’s wages don’t keep up with rising prices. Savings lose purchasing power. Businesses struggle to plan properly because costs become unpredictable. Consumer confidence weakens.

That’s exactly what happened after Covid.

Governments and central banks injected massive amounts of stimulus into economies to support growth during lockdowns. At the same time, supply chains were disrupted globally, energy prices surged, and demand rebounded very quickly once economies reopened.

The Russia–Ukraine War then added another layer of inflation pressure by driving up oil and gas prices significantly.

All of this created the perfect inflation storm:

Which pushed inflation sharply higher across major economies.

In response, central banks raised interest rates aggressively to slow things down.

But how exactly do higher interest rates slow things down? Read on to find out.

This is the part many students memorise but don’t fully understand.

When rates rise, central banks are essentially trying to reduce demand in the economy.

Higher mortgage repayments leave consumers with less disposable income. Credit card borrowing becomes more expensive. Businesses delay expansion plans because financing costs increase. Companies may slow hiring or reduce investment spending.

Over time, this cooling effect reduces demand across the economy.

And when demand starts slowing, businesses lose some ability to keep raising prices aggressively. That’s how inflation gradually starts coming down.

The important thing to understand is that this process takes time. Central banks can’t raise rates today and magically fix inflation tomorrow. Monetary policy works with a lag, which is why markets spend so much time trying to predict where inflation and rates are heading six to twelve months in advance.

Inflation has fallen significantly from the highs we saw in 2022 and 2023. But the problem now is that it’s proving difficult to fully eliminate.

This is what markets mean when they say inflation is “sticky”.

Goods inflation has cooled in many areas because supply chains have improved. But services inflation, wage growth, and housing-related costs remain elevated in several economies.

That’s why markets have repeatedly had to adjust expectations around rate cuts.

At the start of the year, many investors expected central banks to cut rates aggressively. Now expectations are more cautious because inflation data hasn’t weakened enough consistently.

And this matters because markets are forward-looking.

They don’t just react to where rates are today. They react to where investors think rates will be in the future.

So when inflation data comes in hotter than expected, markets immediately start pricing in the possibility that rates may stay higher for longer. Bond yields rise, equities often fall, and volatility increases across financial markets.

The difficult balancing act for central banks is this:

They want to reduce inflation without causing a deep recession.

That’s incredibly hard.

If they keep rates too high for too long, economic growth can slow sharply, unemployment can rise, and markets can weaken significantly.

But if they cut rates too early, inflation could accelerate again and undo all the progress they’ve made.

This is why central banks analyse huge amounts of economic data constantly, including:

They’re trying to judge whether the economy is cooling enough to bring inflation sustainably back toward target levels.

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This is the part interviewers actually care about.

Interest rates influence almost every area of finance:

When rates are high, borrowing becomes expensive, valuations tend to compress, and deal activity slows down.

That’s exactly what happened over the past couple of years. Higher financing costs made acquisitions less attractive, IPO markets weakened, and investment banking revenues declined significantly.

When rates eventually begin falling, the opposite usually happens. Financing becomes cheaper, confidence improves, and activity in capital markets tends to recover.

That’s why markets are still so obsessed with inflation and rate cuts right now. Because underneath almost every major market story is the same question:

When will central banks feel comfortable enough to ease policy?

A lot of students overcomplicate macroeconomics and think they need to sound extremely technical. You really don’t. The simple framework is still the best one:

→ central banks raise rates

→ borrowing and spending slow down

→ inflation gradually falls

→ central banks can eventually cut rates

That cycle drives modern financial markets far more than most people realise.

And if you understand that properly, a lot of finance suddenly becomes much easier to follow.

If an interviewer asks:

“Why are interest rates so important to markets?”

A strong answer could be:

A lot of students try to memorise markets.

That’s the wrong approach.

The students who stand out in interviews are usually the ones who can simplify things clearly and explain the bigger picture properly.

And when you zoom out, a huge amount of what happens in finance comes back to interest rates.

Why markets rally. Why they fall. Why investment banking activity slows down. Why valuations change. Why hiring becomes tougher. Why IPO markets disappear and then suddenly come back.

It all links back to the cost of money.

That’s why central banks matter so much and why markets react so aggressively to inflation data. Investors are constantly trying to predict where rates are heading next because that influences almost every asset class and every part of finance.

The good news is this stuff becomes much easier once you stop trying to sound overly technical and focus on understanding the core mechanism properly.

Higher inflation usually leads to higher rates.

Higher rates slow demand and economic activity.

Slower demand helps bring inflation down.

And once inflation is under control, central banks can eventually start cutting rates again.

That cycle drives modern markets far more than most people realise.

If you understand that properly and can explain it clearly, you’re already ahead of most candidates.

Next week, I’ll be back with another commercial awareness update followed by another deep dive based on the topic readers vote for.

Until then, keep up the hard work!

Afzal