What should I do when the market falls?

Usually nothing, which is harder than it sounds. Falls are a normal feature of what you bought, not a sign it broke. Selling converts a temporary decline into a permanent loss, and then requires you to decide when to return — a decision almost nobody gets right.

Falls are the price, not the fault

The reason investments return more than savings is that they can fall. That is the entire trade. If they never fell, nobody would be compensated for holding them, and they would pay what a savings account pays.

So a falling market is not a malfunction. It is the thing you agreed to when you bought in, arriving as scheduled. Substantial declines happen repeatedly across any long investing life — not as rare catastrophes but as an ordinary recurring feature.

Knowing that in advance does not make it comfortable. It does make it survivable, because the question shifts from “what has gone wrong?” to “is this the thing I was told would happen?”

What selling actually does

While you hold, a fall is a number on a screen. It becomes real money only when you sell.

Sell, and three things happen at once. The temporary decline becomes permanent. You now hold cash that must be reinvested at some point you have to choose. And you have to make that choice while the news is bad — because the low point is only visible afterwards.

Most people who exit during a fall return after the recovery is well underway. They capture the drop and miss the rebound, which is meaningfully worse than having done nothing at all.

Before it happens, not during

Nobody makes good decisions while watching money disappear. The work has to be done in advance:

Only invest money you will not need for years. This is the whole defence. If nothing forces you to sell, a fall is something you wait out. If your rent depends on it, it is a crisis. See saving versus investing.

Keep a buffer in cash. So a bad market and a broken car cannot arrive as one event.

Decide your response before you need it. “If it falls 30%, I will keep contributing and change nothing” is a decision made calmly. Deciding at the moment means deciding badly.

Do not watch it. Checking daily during a fall exposes you to the loss dozens of times without any new information. The people who do best with investments are usually the ones who look least.

If you are contributing, a fall is not bad news

This is genuinely counterintuitive and worth sitting with.

If you are still adding money and will not withdraw for years, falling prices mean your monthly contribution buys more. You are accumulating more units at lower prices, and those units participate fully in whatever recovery comes.

For someone with decades ahead, an extended fall early on is not a disaster — it is a long period of buying cheaply. It only feels catastrophic because the balance is the thing on the screen, and the number of units you own is not.

When action is justified

Rarely, and never in reaction to a price.

Your circumstances changed — you need the money sooner than planned. That is a reason to reduce risk, and it would be true whether the market had fallen or risen.

Rebalancing. If your holdings have drifted from your intended split, a large move is when rebalancing does something. This usually means buying what fell, which is the opposite of panic.

You have learned something about yourself. If a fall showed you genuinely cannot tolerate this, adjusting to a mix you can hold is legitimate. Do it once things have stabilised, not at the bottom — and understand you are accepting lower expected returns for a plan you can actually stay in. That is a real trade, and not a foolish one.

The part nobody says out loud

Doing nothing is an active decision, and it is exhausting. It requires you to check nothing, act on nothing, and ignore commentary designed to be alarming, for months.

That is a genuine skill, and it is worth more than any amount of analysis. The arithmetic of investing is simple enough to fit on a page. Sitting still is the hard part, and it is where almost all the difference in outcomes actually comes from.