Bear markets and crashes

Correction, bear market, crash

A correction is a drop of about 10% from the peak, and they happen almost every year. A bear market is a drop of at least 20%, and it comes every few years. A crash is a fast, steep fall (2008, 2020). These are as certain a part of investing as rises are, and their timing can't be predicted reliably.

The thresholds are a matter of convention, but the distinction is useful because it helps you put the situation in proportion. A correction of about 10% is so common that it's more a sign of a healthy market than an alarm. You'll see only a handful of bear markets in your lifetime as an investor, and deep crashes even more rarely. Once you know the typical depth and frequency of these events, a single drop stops feeling like the end of the world and becomes part of the normal picture.

The key is to accept that drops are the price of investing in stocks, not a flaw in it. That's exactly why stocks return more than cash over the long term: investors are paid for putting up with swings and uncertainty. If the market never fell, the expected return would be at the level of cash. So volatility isn't an obstacle to returns but their source. It's the risk the market pays you for.

Historically, the market has often recovered

The most important lesson from history: a broad, diversified stock market has historically often recovered from drops and gone on to new highs, but recovery isn't guaranteed and has sometimes taken years. Those who stayed invested got the return. Those who sold at the bottom locked in the loss and missed the strongest rise. Time is the best medicine for a falling market when your portfolio is diversified.

It's important to understand the math of recovery: a 50% drop needs a 100% rise to get back to where it was, because you start from a smaller base. That sounds bleak, but historically the market has done exactly this again and again, sometimes in a few months (2020), sometimes over several years (the early 2000s). How long recovery takes varies, but the direction has been the same, as long as you're talking about a broad index and not a single company, which can go bankrupt and never come back.

Two rules follow from this. First, diversification is a precondition for recovery: a single stock can disappear for good, but the broad market can't, because weak companies are replaced by new ones. Second, staying invested is the heart of it all. The market's strongest up days typically come right around the bottom, and missing them wrecks your long-term return. If you sell at the bottom and wait for “confirmation”, you almost always buy back at a higher price.

Forced selling is the real enemy

A drop turns into a permanent loss only if you have to sell under pressure at the bottom. That's why the basics were built in order: an emergency fund prevents forced selling, and the rule “only invest money you won't need for 5–10 years” makes sure you don't have to cash out at the wrong moment. For a monthly investor, a drop is even a chance to buy at a lower price.

Preventing forced selling is a structural solution, not one based on willpower. When your emergency fund covers unexpected expenses and the money you've invested really is long-term money, a falling market can't force you to sell. You can simply wait for the recovery. This is why the time horizon and the emergency fund were already covered in the basics: they're exactly the foundation that holds up in a crash. Without them, even knowing that markets recover doesn't help, because you may not be able to wait.

For a monthly investor, a drop actually turns into an advantage. A fixed euro amount buys more units when prices are lower, so a long downturn during the accumulation phase is a sale, not a disaster. This does mean flipping your perspective, though: media headlines and the red number in your portfolio scream “sell” while the math says “buy”. This clash between emotion and reason is exactly what a plan written in advance is there to answer.

Prepare in advance, not in a panic

The best time to decide how you'll act is now, while the market is calm. Write down a rule: “I won't sell because of a drop. I'll keep up my monthly investing. I'll rebalance once a year.” When the drop comes, you'll have a ready plan, and you won't be making decisions in the grip of emotion.

A playbook written in advance works because it moves the decision away from the moment when you're least able to make it. In the middle of a crash your body is stressed, the news flow is grim and everyone around you is selling. That's the worst possible moment to decide on a strategy. A rule written while you're calm is a gift to your future, panicking self, and it's worth making it so concrete that it leaves no room for interpretation.

A good playbook also covers exceptional situations you've thought through in advance: where you'll get money if you lose your job, when and how you'll rebalance, and the few situations in which you really would sell. Once these are decided in advance, you don't need to decide anything new in a falling market. You just follow the plan. This turns a crash from an anxious crisis into an expected, managed event that you've already lived through in your mind.

What triggers a crash

Every big drop has its own trigger, but the same themes keep coming back underneath. Typical sparks are excessive debt, overpriced assets, a rapid rise in interest rates and an unexpected external shock such as a pandemic or a war. Often a bubble has had years to build up on low interest rates and euphoria, and a small spark is enough to turn the mood. So a crash doesn't come out of nowhere, even though its exact moment can't be predicted.

An important insight is that the next crisis almost always comes from a different direction than the last one. Investors and regulators fix the weaknesses exposed by the last crisis, so a new shock finds a new weak spot. This makes precise prediction practically impossible. That's exactly why your defense isn't guessing the right moment but a portfolio that can take a hit from any direction: diversification, an emergency fund and moderate debt.

The math of recovery

It's worth taking in the asymmetry between falls and rises as numbers. A 20% drop needs a 25% rise to recover, a 33% drop needs a 50% rise, and a 50% drop needs as much as a 100% rise. The deeper the fall, the disproportionately larger the rise it needs, because the recovery starts from a smaller base. This explains why avoiding large losses matters more for your return than chasing large gains.

The same math highlights how destructive selling at the bottom is: if you sell 50% lower and buy back only once the rise has been “confirmed”, you miss exactly the 100% rise that would have restored your capital. Recovery also happens in jerks, on a few strong days that are impossible to time. That's why, for a broadly diversified investor, the best strategy isn't avoiding losses by selling but tolerating them by staying invested.

The big drops in history

History gives you a calibration for what “bad” means. The Great Depression (1929) wiped almost 90% off the stock market, and recovery took decades. The oil crisis (1973–74), the dot-com crash (2000–02) and the financial crisis (2008–09) each took about 50%. The coronavirus crash (2020) knocked a third off the market in a few weeks but recovered at record speed. Each of these felt unique and final at the time, and the broad market eventually recovered from every one of them.

You shouldn't conclude from this that recovery is guaranteed or quick. The Japanese stock market needed more than 30 years to get back to its 1989 peak, which is an important reminder of concentration risk and of the value of diversifying across countries. The right lesson is a sense of proportion: drops have been deep and frightening, but a globally diversified, patient investor has so far always been rewarded for patience. History doesn't promise the future, but it gives you perspective on panic.

Volatility and fear gauges

Fear in the market can also be measured. Volatility means how strongly prices swing, and one way it's tracked is the VIX index, known as the “fear gauge”. In calm times volatility is low, and in a crisis it shoots up as uncertainty and trading pick up. High volatility isn't the same as a drop, but the two usually come together: fear and swings go hand in hand.

For an investor, volatility cuts both ways. It measures discomfort, but moments of high fear have historically been the best times to buy, not times to sell, because that's exactly when the expected return is elevated, since risk pays the most. A long-term investor doesn't need to watch fear gauges every day, but understanding their logic helps: when everything around you is screaming fear, you're typically closer to the bottom than the top.

Cash, dry powder and buying power

A small cash weighting isn't inefficient but a strategic choice, known as “dry powder”. In a falling market it serves two purposes: it prevents forced selling by giving you a buffer for expenses, and it gives you buying power exactly when prices are low. An investor who has a little cash when a crash begins can turn the crisis into an opportunity instead of becoming its victim.

Balance matters, though: too large a cash weighting is a losing choice over the long term, because it doesn't earn more than inflation, and sitting on the sidelines costs more on average than the occasional drop. Cash is insurance and a tool, not an investment strategy. For most people a moderate buffer is enough. Timing the market with a large cash pile is a temptation that rarely pays off, because hitting the right moment to get back in is almost impossible.

Rebalancing in a falling market

Rebalancing is one of the few mechanical ways to benefit from a drop without having a view on the market. When stocks fall, their weight in your portfolio drops below the target, and rebalancing means buying the asset class that has fallen behind. In other words, buying stocks cheap and selling bonds high. The rule forces you to act against your emotions: to buy exactly what scares you.

It's best to rebalance by rules, not by market mood: either by the calendar (once a year) or by a threshold (when a weight drifts more than 5 percentage points). During the accumulation phase, the most efficient approach is to direct new monthly contributions automatically into the asset class that has fallen, so that rebalancing happens partly without sales or taxes. This way a falling market isn't just an ordeal but also a systematic opportunity to improve your long-term return.

Invest all at once or gradually

After a crash, or when you have a large sum of cash, the same question always comes up: should you invest it all at once or gradually? Statistically, a lump-sum investment wins more often, because the market rises more than it falls and money sitting on the sidelines misses out on returns. But psychologically, investing gradually (for example, evenly over 6–12 months) is easier for many people, because it reduces regret if the market falls right after a large investment.

A practical compromise is to combine the two: invest part right away and the rest on a schedule. This gives you part of the statistical advantage of a lump sum while softening the risk of buying at the peak. The most important thing isn't finding the mathematically optimal approach but one you can stick with to the end. A half-finished “I'll time the rest later” is worse than either consistent strategy.

The role of the media and the news flow

The media amplifies the emotional load of a falling market, because fear sells better than calm. During a crash the headlines are dramatic, experts forecast further falls, and every red day gets its own alarm. This news flow is designed to provoke a reaction, not to support long-term decision-making, and a reaction is exactly what an investor needs to avoid.

Your protection is deliberate distance: follow the news less in a falling market, don't check your portfolio every day, and remember that news of a crash always arrives after the fact, once the drop has already happened. Nobody rings a bell at the bottom. The less you let the real-time news flow steer your emotions, the more likely you are to stick to your plan, and sticking to your plan is the whole game in a falling market.

Mental preparation

Beyond the numbers, you also prepare for a drop mentally. It helps to imagine in advance what −30% or −50% in your portfolio feels like and decide now how you'll act then. This “mental rehearsal” lessens the shock when the drop really comes, because you've been through it in your mind and you know it's part of the game. A surprise causes panic. An expected event doesn't.

Just as important is sizing your risk in advance to match your tolerance. If you know you couldn't live with a portfolio cut in half without selling, a high equity weighting is too much risk for you, whatever a calculator recommends. The right equity weighting is the one you can sleep with and that you'll also hold at the bottom. Realistic self-knowledge before a drop is worth more than any strategy during one.

The most common mistakes in a falling market

The mistakes made in a falling market are familiar, but they keep repeating because emotion beats knowledge. Panic selling at the bottom locks in the loss. Stopping your saving just when units are cheap leaves returns on the table. Waiting for the right moment to get back in almost always leads to buying at a higher price. And staring at prices feeds all of these. Every one of these mistakes feels like sensible caution at the moment you make it.

Less obvious but just as costly are excessive leverage, which can force you into selling right at the bottom, and concentrating on a single holding, which may turn out to be one of the companies that never recover. The antidote to all of these is the same: diversification, an emergency fund, moderate debt and a plan written in advance. They don't prevent drops, but they prevent a drop from turning into permanent damage.

How to get through a crash: a checklist

Preparing for a falling market comes down to a few points that are worth having in order before the drop comes:

• Emergency fund in place: prevents forced selling when expenses come up during the drop.
• The right time horizon: the money you've invested really is 5–10+ year money.
• A written playbook: “I won't sell because of a drop, I'll keep saving, I'll rebalance”, decided in advance.
• Moderate leverage: debt must never force you to sell at the bottom.
• Diversification: the broad market recovers, a single company doesn't necessarily.
• Follow less: the news flow and staring at prices every day feed panic.

Once these are in order, a falling market turns from a crisis into an expected phase that you've already been through in your mind. You don't beat a crash by predicting it but by withstanding it, and that resilience is built in calm times, not in the storm.