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What Are Interest Rates and Why Does Every Market Move When the Fed Speaks

The single most important number in global finance, explained from first principles. Updated with the Jul 1 NFP miss at 57K and what it means for rate expectations.

What Are Interest Rates, Really?

Strip away the jargon and an interest rate is the price of borrowing money. When you take out a mortgage, the rate is what the bank charges you for using their capital. When a company issues bonds, the rate is what they pay investors for lending them cash. When a government needs to fund itself, Treasury yields reflect how much it costs them to borrow from the market.

In the United States, the most important interest rate is the federal funds rate. This is the rate at which commercial banks lend to each other overnight. The Federal Reserve does not set this rate by decree. Instead, it sets a target range and uses open market operations to keep the actual rate within that band.

Right now, the federal funds rate target is 5.25-5.50%. That number ripples through every corner of the financial system. Your savings account yield, your car loan cost, the rate on your credit card, the discount rate applied to every stock in your portfolio. All of it traces back to this one number.

Rate Hike vs Rate Cut: What Is the Difference?

A rate hike makes borrowing more expensive. Banks pay more to lend to each other, so they charge you more for mortgages, business loans, and credit lines. The intention is to slow spending, cool inflation, and prevent the economy from overheating. Think of it as the Fed tapping the brakes.

A rate cut does the opposite. Cheaper borrowing encourages businesses to invest, consumers to spend, and risk-takers to put capital to work. The Fed cuts rates when the economy needs support, when unemployment is rising, or when growth is slowing. Think of it as the Fed easing off the brakes to let the car accelerate.

Between March 2022 and July 2023, the Fed hiked rates from near zero to 5.25-5.50%, the most aggressive tightening cycle in four decades. They did it because inflation hit 9.1%, the highest in 41 years. Every one of those hikes sent shockwaves through markets.

Why Does the Fed Change Rates?

The Federal Reserve has a dual mandate from Congress: maximum employment and stable prices. Every rate decision is an attempt to balance these two objectives, which often pull in opposite directions.

When inflation runs hot, the Fed raises rates to slow demand and bring prices down. But higher rates also make it harder for businesses to expand and hire, which can push unemployment higher. When employment weakens, the Fed considers cutting rates to stimulate growth, but that risks reigniting inflation.

This is exactly the tension playing out right now. Non-Farm Payrolls on Jul 1 printed at just 57K, well below the 140K consensus. That is the weakest jobs number in over two years. The labour market, which had been stubbornly resilient through months of elevated rates, is finally showing cracks.

Before that print, markets priced a 67% probability of another rate hike. Within hours, that dropped to 50%. The logic is straightforward: if employment is deteriorating, the Fed has less room to tighten further without risking a recession. The dual mandate is reasserting itself.

How Stocks React to Rate Changes

The connection between interest rates and stock prices is mathematical before it is emotional. Every stock is theoretically worth the present value of its future cash flows. To calculate that present value, you discount future earnings back to today using a rate. When that discount rate rises, future earnings are worth less in today’s terms. When it falls, they are worth more.

This is why growth stocks, particularly technology companies, are the most rate-sensitive. A company generating most of its earnings five or ten years from now sees the present value of those earnings swing dramatically with small rate changes. A company paying a fat dividend today is far less affected.

What happened on Jul 1

When NFP printed at 57K, tech stocks initially rallied. The reasoning was simple: weaker jobs mean the Fed is less likely to hike, which means the discount rate stays lower, which means growth stocks are worth more. The NAS100 jumped over 1% in the first 30 minutes.

Then it reversed. Why? Because a truly weak labour market also means the economy is slowing, which threatens corporate earnings. The market went from celebrating cheaper money to worrying about whether there would be any money to earn. That push and pull between rates and earnings is the fundamental story of equity markets right now.

How Bonds React to Rate Changes

Bond prices and interest rates move in opposite directions. This is not a tendency or a pattern. It is an arithmetic certainty.

Here is why. Imagine you hold a bond paying 4% annually. If the Fed hikes rates and new bonds are issued at 5%, nobody will pay full price for your 4% bond. Its price drops until its effective yield matches the new 5% market rate. Conversely, if rates fall to 3%, your 4% bond becomes more attractive and its price rises.

This inverse relationship is the foundation of fixed-income investing. It is also why bond portfolios got destroyed in 2022 when rates moved from zero to 5% in 18 months. The Bloomberg US Aggregate Bond Index had its worst year in recorded history.

For your portfolio, this matters because bonds are traditionally the ballast that offsets stock volatility. But when rates are rising aggressively, both stocks and bonds can fall at the same time, which is exactly what happened in 2022. Understanding the rate cycle tells you whether your “safe” assets are actually safe.

How Gold Reacts to Rate Changes

Gold pays no interest. No dividends, no coupons, nothing. Holding gold costs you whatever yield you could have earned by holding bonds instead. Economists call this the “opportunity cost” of holding gold.

When interest rates are high, that opportunity cost is steep. Why hold a lump of metal earning nothing when you could own a Treasury bond paying 5%? This is the gravitational force that typically pulls gold prices down during rate-hiking cycles.

When rates fall, or when markets expect them to fall, the calculus flips. If bonds are only yielding 2%, the cost of holding gold drops substantially. Money flows out of bonds and into gold.

Gold at $4,140: what the NFP miss triggered

Gold rallied to $4,140 on the NFP miss because the market immediately repriced rate expectations lower. If the Fed is less likely to hike, real yields (interest rates minus inflation) decline, and gold becomes relatively more attractive. The move was swift and decisive: gold gained over 2% within the session.

But gold is also a fear trade. When employment collapses, investors seek safety. Gold serves double duty in that environment: it benefits from both falling rate expectations and rising uncertainty. That combination is why gold has been one of the strongest asset classes in 2026.

How Currencies React to Rate Changes

Capital flows towards higher returns. If US interest rates are the highest among developed economies, global investors move money into dollars to capture that yield. More demand for dollars means a stronger dollar.

This is why the Dollar Index (DXY) strengthened throughout 2022-2023 as the Fed hiked aggressively. Higher US rates attracted capital from Europe, Japan, and emerging markets. The dollar hit 20-year highs.

On Jul 1, the NFP miss weakened the dollar immediately. The logic follows directly: if the Fed is now less likely to hike (probability dropped from 67% to 50%), the yield advantage of holding dollars narrows. Capital starts looking elsewhere. EUR/USD and GBP/USD both rallied on the print.

For international investors, this dynamic matters enormously. A strengthening dollar erodes returns on foreign assets. A weakening dollar amplifies them. The rate cycle does not just affect US markets. It reshapes the return profile of every asset denominated in every currency.

How Rates Affect Mortgages and the Real Economy

Interest rates are not abstract. They show up in your monthly payments.

• Mortgages: The average 30-year fixed mortgage rate tracks the 10-year Treasury yield. When the Fed hikes, mortgage rates rise. At 7.5%, a $400,000 mortgage costs roughly $2,800 per month. At 4%, that same mortgage costs $1,910. That $890 monthly difference prices millions of people out of the housing market.
• Car loans: Auto loan rates have risen from around 4% in 2021 to over 8% in 2026. Monthly payments on a $35,000 vehicle have increased by approximately $120.
• Credit cards: Most credit card rates are variable, directly linked to the federal funds rate. The average credit card APR has climbed above 24%, the highest on record.
• Business investment: Companies considering expansion, new equipment, or hiring weigh the cost of financing. Higher rates make marginal projects uneconomic. This is precisely how monetary policy transmits through the economy: by raising the bar for what investment is worth doing.

This transmission mechanism is why the NFP print matters beyond markets. A slowing labour market is not just a data point. It is evidence that higher rates are doing their job, perhaps too well. Every month of restrictive policy increases the risk of overtightening.

The Current Situation: Where We Stand Today

Here is the state of play as of Jul 3, 2026:

The NFP miss at 57K was the most consequential jobs report in months. Before it, the market was leaning towards another hike. After it, the picture is split. Rate hike probability dropped from 67% to 50%, which in practical terms means the market genuinely does not know what the Fed will do next.

The next major catalyst is the FOMC Minutes release on Jul 9. These minutes will reveal how divided the committee was at the last meeting, whether the doves are gaining traction, and how much weight the Fed is giving to employment data versus inflation. If the minutes show growing concern about the labour market, rate hike expectations could drop further. If they show a committee still focused primarily on inflation, the 50% could climb back towards 67%.

Beyond the minutes, key data points to watch include CPI on Jul 11, Initial Jobless Claims (weekly), and the next NFP report on Aug 5. Each of these will shift the probability in one direction or another. The market is data-dependent because the Fed is data-dependent.

Recent Fed Rate Decisions and Market Reactions

Notice a pattern. Every hold decision still moves markets, because the commentary and projections that accompany the decision matter as much as the decision itself. The Fed speaks, and even when it does nothing, the market listens.