What Is a Recession and How Does It Affect Your Investments?

What Is a Recession?

A recession is a period when the economy shrinks instead of grows. Think of the economy like a car cruising down a highway — a recession is when it slows down significantly and starts rolling backward for a while. Officially, the National Bureau of Economic Research (NBER) defines a recession as a significant decline in economic activity that spreads across the economy and lasts more than a few months.

During a recession, businesses earn less revenue, unemployment tends to rise, and people generally spend less money. Since 1950, the United States has experienced 11 recessions, each lasting an average of about 10 months.

How Does It Work?

Recessions are a normal part of what economists call the "business cycle" — the natural pattern of economic expansion and contraction. The economy grows for a period (expansion), reaches a high point (peak), contracts for a while (recession), hits a low point (trough), and then starts growing again.

The NBER looks at three main criteria when deciding whether a recession has started: depth (how much the economy has declined), diffusion (how widespread the decline is across different sectors), and duration (how long it lasts). A downturn doesn't need to check all three boxes equally — a very deep decline, for example, might qualify even if it is relatively short.

So what happens to the stock market during a recession? History tells an interesting story. Looking at the 11 recessions since 1950, the S&P 500 (a broad index tracking 500 large U.S. companies) has declined an average of about 21% from its peak to its lowest point during the downturn. That low point typically arrives about halfway through the recession — roughly 5 to 6 months in.

Here is the part that surprises many people: by the time a recession officially ends, the market has often already started recovering. On average, the S&P 500 was down only about 1% from start to finish of a recession. That is because markets tend to look ahead. They start pricing in a recovery before the economic data confirms it.

Why Does It Matter for You?

If you are building long-term wealth — saving for retirement, for example — recessions are something you will almost certainly live through multiple times. Understanding how they work can help you avoid making emotional decisions with your money when headlines get scary.

The historical record offers a useful perspective. After every recession since 1950 (except the 2001 dot-com downturn), the S&P 500 delivered positive returns in the 12 months following the recession's end, averaging about 15.5%. Looking further out, the average return from the market's lowest point during a recession was roughly 50% over one year, 79% over three years, and 142% over five years.

This does not mean every recession plays out the same way or that past performance predicts future results. But it does illustrate that economic downturns, while uncomfortable, have historically been temporary. The investors who stayed patient and maintained a long-term perspective were often in a better position than those who stepped away from the market during the turbulence.

Common Mistakes to Avoid

Making decisions based on fear. When the economy contracts and account balances drop, the instinct to move everything to cash can feel overwhelming. But exiting the market during a downturn means you might miss the early stages of the recovery, which are often the strongest.
Trying to time the bottom. Nobody rings a bell when the market hits its lowest point. Even professional fund managers consistently struggle to predict when downturns start and end. Waiting for the "perfect" moment to get back in often means waiting too long.
Ignoring your time horizon. A recession looks very different if you need the money next year versus 20 years from now. Younger investors with decades ahead of them have historically benefited from staying the course through downturns.

Key Takeaway

A recession is a temporary contraction in economic activity, not a permanent state. Since 1950, every U.S. recession has been followed by a recovery. While downturns can be stressful, understanding that they are a normal part of the economic cycle — and that markets have historically bounced back — can help you make more informed decisions about your long-term financial plan.

This explainer is AI-generated for educational purposes. It is not financial advice. Always do your own research or consult a qualified financial advisor.