Sooner or later, the stock market falls, and it usually falls faster than anyone expects. Headlines turn red, account balances shrink, and a quiet voice starts asking whether it would be wiser to sell everything and wait for calmer days.
That voice is natural. But for long-term investors, the decisions made during a crash often matter more than the crash itself. This guide explains how often declines happen, why selling feels so tempting, and what a calm, practical response looks like.
Declines Are a Normal Part of Investing
A falling market feels like an emergency, but history shows it is closer to a regular feature. Over the past several decades, the S&P 500, an index of roughly 500 large U.S. companies, has gone through many declines of 10% or more, and a smaller number of deeper ones of 20% or more, which are commonly called bear markets.
No one can predict when the next one will begin or how far it will go. What an investor can do is decide in advance how to behave, so that the decision is not made in the middle of the fear.
What Past Crashes Actually Looked Like
The table below shows five of the largest declines in the S&P 500 since the 1970s, measured by the price index (without dividends).
Decline | Peak to trough | Time until the index returned to its prior high |
|---|---|---|
1973–74 oil crisis | −48.2% | About 7.5 years (July 1980) |
2000–02 dot-com crash | −49.1% | About 7 years (May 2007) |
2007–09 financial crisis | −56.8% | About 5.4 years (March 2013) |
2020 COVID-19 crash | −33.9% | About 6 months (August 2020) |
2022 rate-hike decline | −25.4% | About 2 years (January 2024) |
Two lessons stand out. First, the drops were severe, and recoveries sometimes took years, so patience is a real requirement and not a slogan. Second, in every case shown here, the market eventually reached a new high. Dividends, which are not counted in these figures, shortened the real recovery time for investors who reinvested them.
That second point is a fact about the past. It is not a promise about the future. Figures are drawn from a compilation of S&P 500 corrections since 1950.
Why Selling Feels So Right (and Usually Isn't)
Behavioral research has long shown that people feel losses roughly twice as strongly as equal gains, an idea known as loss aversion. When your portfolio falls, your brain treats it as a threat, and selling feels like the way to make the pain stop.
The problem is timing. To benefit from selling, you need to be right twice: once when you sell, and again when you buy back. Most people sell after prices have already dropped and return only after they have recovered, which locks in the loss and misses the rebound.
A sale also turns a temporary paper loss into a permanent one. As long as you stay invested, the shares you own can recover. Once you sell, they cannot recover for you.
The Math of Staying Invested
Consider Sarah, a 32-year-old renter with a $4,000 monthly take-home pay who invests $400 every month for retirement. Her portfolio is worth $20,000 when a crash begins, and it falls 30%, to $14,000.
It hurts to watch. But look at what her next $400 contribution does. Prices are 30% lower, so the same $400 buys about 43% more shares than it did before the drop (1 ÷ 0.70 ≈ 1.43). If Sarah keeps investing through the decline, she is buying the same companies at a discount.
If she stops contributing or sells, she gives up those cheaper shares. When prices eventually recover, as they have after past declines, the shares bought during the downturn are the ones that gain the most. This example is hypothetical, and it assumes a recovery that cannot be guaranteed. Still, it shows why steady contributions are one of the few things working in an investor's favor during a crash.
The Cost of Missing the Best Days
The market's best days tend to arrive in the middle of its worst periods, which makes them almost impossible to catch if you have stepped aside.
J.P. Morgan Asset Management studied the S&P 500 from January 3, 2005, to December 31, 2024. A $10,000 investment left untouched grew to $71,750, an annualized return of 10.4%. Missing only the 10 best days reduced the final balance to $32,871, or 6.1% a year. In the same research, seven of the 10 best days occurred within two weeks of the 10 worst days.
So an investor who sold during the panic would have been out of the market at exactly the wrong time. Past performance does not guarantee future results, but the pattern is a useful reminder of what timing the market really requires.
What to Do When the Market Falls
Check your time horizon. Money you will not need for 10 years or more has time to recover. Money you need soon should not be in stocks at all.
Make sure you do not have to sell. An emergency fund in a savings account means a car repair or a job loss does not force you to sell investments at a low.
Keep your automatic contributions running. Automation removes the decision, and the decision is where most mistakes happen.
Write a crash plan before the crash. A few lines are enough: "If the market falls 30%, I will keep investing, I will not sell, and I will review my plan only after 30 days." Reading your own words in a stressful moment is surprisingly effective.
Check less often. Looking at your balance daily during a decline mostly adds stress. Weekly or monthly is plenty.
Rebalance only if your plan says so. If you have a target mix, such as 80% stocks and 20% bonds, a large drop may pull you away from it. Restoring the mix is a rule-based move, not a reaction to fear.
What Not to Do
Do not sell everything in a panic. It converts a temporary decline into a permanent loss and requires you to guess when to return.
Do not try to time the bottom. No one rings a bell at the lowest point, and waiting for "clarity" often means buying back at higher prices.
Do not follow every headline. News is built to capture attention, and crashes produce the most alarming coverage.
Do not borrow to invest more. Leverage turns a bad stretch into a serious problem.
Do not make a sudden strategy change. Switching to the latest hot idea after a drop is another form of reacting instead of planning.
When a Crash Is a Real Problem
Everything above assumes you are investing money for the long term. A crash becomes a genuine problem when you will need the money soon.
Suppose you plan to buy a home in two years and your down payment is invested in stocks. A 30% decline right before the purchase could force you to delay or to settle for less, and the market may not recover in time. That is not a failure of discipline. It is a mismatch between the investment and the goal.
A useful rule of thumb is that money needed within roughly the next few years belongs in lower-risk places, such as a savings account, rather than in stocks. If a crash has revealed that you are taking more risk than you can live with, it is reasonable to adjust your plan calmly, once the panic has passed, and not during it.
The Short Version
Market declines are normal, and some of them are severe, with recoveries that can take years.
Selling feels safe but locks in losses and risks missing the best recovery days.
Continuing to invest during a decline means buying shares at lower prices.
Prepare before it happens: a funded emergency fund, automatic contributions and a written plan.
Money you need soon should not be exposed to stock market risk.
Disclaimer: This article is for educational and informational purposes only and does not constitute financial, investment, tax or legal advice. Investing involves risk, including the possible loss of the money you invest. Past performance does not guarantee future results. Examples, including the people and figures used, are hypothetical and are provided for illustration only. Consider your personal situation and consult a qualified professional before making financial decisions.
