In the world of economics, the interest rate acts like “Earth's gravity” for every financial asset. The higher interest rates go, the stronger that gravitational pull becomes, and the harder it gets for asset prices to jump higher; conversely, when interest rates fall, gravity weakens and assets start to fly. Central bank decisions about changing interest rates are the single most important event that determines the direction of every financial market in the world.
The central bank and the concept of “the cost of money”
Think of a central bank like the “main valve” controlling money in a country. When interest rates rise, borrowing becomes very expensive for people and companies, and people prefer to park their money in the bank and collect risk-free returns. When interest rates fall, bank returns are no longer attractive and borrowing becomes very cheap; money exits the banks and flows into the markets.
The mechanism behind how interest rates affect different assets
In the stock market, high interest rates cause stock prices to fall, because attractive bank returns pull investors out of the market and companies earn less profit due to more expensive loans; low interest rates do the opposite. In gold and precious metals, high interest rates cause gold's price to fall because gold pays no annual return and holding it creates a high opportunity cost; low interest rates make gold attractive again. In the cryptocurrency market, high interest rates cause a sharp crypto crash because society's liquidity shrinks and investors cash out their riskier coins; low interest rates fuel a rally in Bitcoin and altcoins. In the forex market, a rise in a country's interest rate strengthens its national currency, because global demand for depositing in that currency rises.
Two overall cycles: expansionary versus contractionary
A contractionary (hawkish) policy aims to tame inflation by raising interest rates, and its result for risky markets is usually a recession and falling prices. An expansionary (dovish) policy aims to boost the economy by cutting interest rates and printing money, and its result for financial markets is accelerated growth and price bubbles. A trader who doesn't follow changes in interest rates and central bank policy is like a swimmer fighting against the current of a roaring river.
How inflation forces the central bank's hand
A central bank in any country is like the driver of a large bus with two pedals under its feet: the gas pedal (cutting interest rates for growth) and the brake pedal (raising interest rates to tame inflation). Once inflation crosses a certain threshold, people's purchasing power falls and the red alarm goes off at the central bank. To put out the fire of inflation, the central bank has only one immediate, powerful tool: raising interest rates. This makes borrowing expensive, makes deposits attractive, and demand cools off, and inflation is eventually smothered — but this doesn't come without cost for financial markets.
When interest rates rise, a domino chain reaction happens across financial markets: stocks and companies experience a recession and a selloff because companies can't get cheap loans and their sales fall; risky markets like crypto crash because there's no more surplus liquidity to flow into them; gold comes under selling pressure because the opportunity cost of holding it rises; and that country's national currency becomes sharply stronger because every investor in the world wants to deposit in it.
If the central bank keeps interest rates that high long enough to break inflation, a bitter side effect occurs: economic recession and unemployment. When factories shut down because of heavy bank interest costs, the economy risks collapsing from the other direction, and the central bank is forced to cut interest rates again. As rates fall, money sleeping in the banks is freed up again, loans become cheap, people start spending again, and stocks, crypto, and gold take flight; this process continues until new inflation forms all over again. This endless cycle between “inflation” and “interest rates” is the main engine driving every major swing in the history of financial markets.
How to trade on the day a central bank announces its rate decision
The days when the Federal Reserve announces its interest rate decision are like violent storms in the ocean of financial markets, because prices shift direction based on “market expectations” and “the tone of the speech,” not merely the number that's announced. The biggest mistake beginner traders make is entering a trade in the exact seconds around the news release, because the spread widens sharply and your order may execute with severe slippage; the best approach is to not touch the trade button for at least 15 to 30 minutes after the main number is announced. Sometimes the market has already made its move before the official announcement; if everyone was already expecting a rate hike and the news comes out as expected, big traders take profit and, against popular expectation, the price jumps in the opposite direction. Paying special attention to the central bank chair's tone during the speech is also critical: a hawkish tone strengthens the national currency and pressures gold and stocks lower, while a dovish tone lifts gold, crypto, and stocks. If you absolutely must trade on news day, cut your position size to a half or a third of your normal size, and it's better to wait until the initial excitement of the news fades and the real direction becomes clear on the chart.