Time in the market, not timing it
Volatility only turns into loss at one moment: when you sell.
5 min read
Volatility and permanent loss sound like the same thing. They are not, and confusing them causes most bad investing decisions.
Volatility (how much the price bounces around) is movement. Your $50,000 holding is worth $42,000 in March and $58,000 in November. Nothing has been lost or gained until you act. The underlying businesses still own their mines, their factories and their customer contracts.
Permanent loss is different in kind. The business failed, and the money is not coming back.
What history actually shows
Over 1 year, losing money in the share market is common. Over 5 years, it is uncommon. Over 20 years, on the longest record available, it has essentially never happened.
| Holding period | Roughly how often it ended below where it started |
|---|---|
| 1 year | about 25% of the time |
| 5 years | about 10% |
| 10 years | about 6% |
| 20 years | essentially never |
These figures come from S&P 500 rolling periods on a total-return basis.[1] The table looks at every rolling period in its history and asks: how often did an investor end up with less money than they started with? For a 1 year holding period, across every 12 month stretch on record, the S&P 500 lost money about 25% of the time. The pattern is clear: the longer your time horizon, the less likely you are to lose money.
Most years in the share market are positive. Losing money is the exception, not the rule.
Two honest caveats. History is not a guarantee, and this is one country's record over a favourable century, which makes it a limited sample. These figures are also nominal, not adjusted for inflation, so the rising cost of living quietly erodes real returns underneath.
The reasons are always convincing
Markets do not fall for no reason. They fall alongside genuinely frightening and correctly reported events. March 2020: a global pandemic, borders closed, nobody able to say how long any of it would last. 2022: a war in Ukraine, an energy shock, the fastest rate rises in a generation. 2008: institutions that had stood for a century failing inside a fortnight.
Every one of those was a real crisis. Every one was also a terrible moment to sell. The reasons are real. They are simply not predictive, and that is the uncomfortable part.
Nobody knows what the next 20 years will bring. What is certain is that there will be more downturns, and each one will arrive with a perfectly good reason to panic. You cannot predict when, but you can prepare. That is the job of the emergency fund: it lets you sit through the storm instead of selling in it.
The rule that follows
Do not invest money you will need within 5 years. It sounds like a platitude, and it is not. Money with a short time horizon (how many years until you need it) can be caught by a bad window, and someone forced to sell in a bad window turns volatility into permanent loss. The rule is not about the market. It is about removing the circumstance in which you have no choice.
That is also why the emergency fund comes before any investing at all. The ordering was never arbitrary, and Lesson 7 covered exactly why.
Notes
Check yourself
2 questions on this lesson. Nothing is recorded or sent anywhere.
1When does volatility become a real loss?
A fall costs you nothing until you turn it into cash, which is why being forced to sell is the actual danger.
2According to this lesson, what can you actually know about future market downturns?
You cannot predict the timing. What you can do is prepare for the certainty that more downturns are coming, which is exactly what the emergency fund is for.