Biggest Mistake You Can Make When the Market Is Down

As we write this in April 2026, the headlines have been relentless. A US-Iran military conflict that began on February 28 sent shockwaves through every market on the planet. Iran closed the Strait of Hormuz, choking off roughly 20% of the world's oil supply. Oil prices surged nearly 66%, from around $67 per barrel to over $111 per barrel in a matter of days. At their worst, the S&P 500 was down roughly 7% for the year, and the Nasdaq had fallen more than 10%.

You have seen these headlines. You have probably felt that tight knot in your stomach when you opened your investment app and saw red across the board. If so, you are not alone. And that reaction is completely natural.

But here is what the news cycle will not tell you. The market has been here before. Not once, not twice, but over and over again across decades. And every single time, the investors who came out strongest were not the ones who reacted the fastest. They were the ones who stayed the course the longest.

This has happened before. And the market came back every time.

If you zoom out far enough, a pattern becomes impossible to ignore. Markets fall, sometimes sharply, sometimes for reasons that feel genuinely terrifying at the time. And then they recover. Not overnight, but reliably and consistently, over time.

The Global Financial Crisis wiped out nearly 57% of the S&P 500's value over 17 agonising months. Within five years of hitting bottom, the index had climbed roughly 176%. The COVID-19 crash erased 34% in just 33 days, the fastest bear market ever recorded. Five years later, the market was up roughly 153%. Even Black Monday in 1987, which saw the largest single-day percentage crash in S&P 500 history, was fully recovered within two years — with the S&P 500 actually finishing 1987 in the green for the calendar year.

And here is perhaps the sharpest recent example. On April 8, 2026, just weeks after investors were bracing for the absolute worst of the Iran crisis, markets surged on ceasefire news. The S&P 500 jumped 2.5% in a single session. The Dow gained roughly 1,300 points, its best day since April 2025. By April 13, the S&P 500 had erased virtually all of its war-related losses. Investors who had already sold in panic during March missed the bounce entirely. They locked in their losses right before the recovery arrived.

The pattern does not guarantee the future, but it tells you something critical about the past — reacting to fear has consistently been more expensive than sitting through it.

The 3 mistakes most investors make when markets fall

Mistake 1: Panic selling to "protect" yourself

When your portfolio is deep in the red, selling feels like the responsible thing to do. Get out now, before it gets worse. Cut your losses and protect what you still have left.

But selling during a downturn does not protect you. It locks in the loss permanently. You are converting a temporary decline on paper into a real, irreversible loss in your bank account. And worse, you remove yourself from the recovery entirely.

Mistake 2: Waiting on the sidelines for the "right moment"

This one feels smarter. You have sold, or maybe you are holding cash, waiting for the situation to stabilise. Once the dust settles, once the conflict ends, once there is certainty again, you will get back in. Sounds strategic, right?

In reality, by the time things feel safe, the market has usually already recovered. You end up buying back in at a higher price than you sold. Research from JP Morgan Asset Management makes this painfully clear. If you had invested $10,000 in the S&P 500 over the 20 years ending December 2024, staying fully invested would have grown your money to $71,750. Missing just the 10 best trading days would have cut that to $32,871. Less than half, from missing just ten days out of roughly 5,000.

The biggest rebounds happen right after the biggest drops. If you are sitting on the sidelines during the scary parts, you almost certainly miss the best parts too. The April 8 ceasefire rally is a textbook case. It happened when sentiment was at its lowest. The investors who had already exited missed one of the strongest single-day gains of the year.

Mistake 3: Treating short-term news as long-term truth

This mistake is the subtlest, because it feels like the opposite of a mistake. It feels like being informed. The war is real, the oil disruption is real, the recession talk is real, and you are not imagining any of it.

But what the market does this week and what your investments are worth five or ten years from now are two very different things. Markets move on fear, speculation, and expectation. They tend to overshoot on bad news and undershoot on good news. Short-term volatility is noise. Long-term value is the signal. The mistake is reacting to noise as if it were signal.

Consider March 2009. The global economy genuinely felt like it was collapsing. Banks were failing, and entire countries were at risk of default. Yet March 2009 turned out to be one of the single best moments in history to be invested, with the S&P 500 returning roughly 17% annually over the following decade. The same was true of March 2020, when the entire world shut down. The investors who benefited most were not optimists or fortune-tellers. They were simply people who did not sell.

Investing consistently, no matter what

There is one approach that removes nearly all the emotion from this process. It is simple enough to explain in a single paragraph, and powerful enough to have worked through every crash in the table above.

You invest a fixed amount every month, automatically. Regardless of whether the market is up or down. When prices drop, your fixed amount buys more units of your investment. When prices recover, those extra units are worth more. Over time, you end up paying an average cost that smooths out the highs and the lows. The dip actually works in your favour, as long as you stay in.

Here is how this plays out in real life. Imagine Sarah invests RM300 every month into a diversified halal portfolio. In January and February 2026, her RM300 buys a certain number of units at prevailing prices. Then the Iran crisis hits, and markets fall. In March and April, her RM300 now buys more units than before, because each unit costs less. She is getting more for the same money.

Six months later, as markets recover, all those extra units Sarah accumulated during the dip have grown in value. She did not need to predict the conflict. She did not need to time the ceasefire. She did not need to stare at oil price charts at 2 am. She just needed to show up consistently, month after month, and let the maths do the work.

What each response to a market drop actually costs you

The difference between these three paths is not intelligence. It is not about having insider information or access to expert analysts. It is behaviour. And unlike the market, your behaviour is something you can actually control.

When others panic, clarity is your edge

Let us be honest. It is hard to watch your portfolio go red and do nothing. That discomfort is real, and it is deeply human. Nobody enjoys seeing their money shrink on screen, even when they understand it is temporary.

But the evidence is remarkably consistent across decades of market history. The investors who come out ahead are not the ones who reacted fastest to bad news. They are the ones who stayed the course longest. From Black Monday in 1987, to the Global Financial Crisis, to the pandemic crash, to the Iran conflict — the lesson repeats itself. The market recovers. The question is whether you are still invested when it does.

You do not need to predict what the market will do next. You do not need to follow every headline or decode every geopolitical development. You just need to not react emotionally.