Time In, Not Timing
What does waiting for the right moment actually cost?
The idea
Long-run returns are concentrated in a small number of days, and missing them costs more than avoiding the worst ones gains.
In the real world
Sitting out a handful of the strongest days sharply reduces a decade's return.
Going deeper
Long-run returns are concentrated in a small number of days, and those days cluster near the worst ones. Exiting to avoid a decline therefore tends to mean being absent for the recovery.
Re-entry is the harder half. It requires a second correct decision at the moment when confidence is lowest and the news is worst, and most people who exit do not return until the recovery is well established. Missing a handful of the strongest days removes a large share of a decade's return, which is why the cost of waiting for a better moment is usually larger than the drawdown avoided.
Where it stops applying
This applies to long-horizon investing in diversified assets. It is not an argument against ever selling, against rebalancing, or against reducing risk when your circumstances or time horizon genuinely change.
Why it matters
It explains why waiting for a better moment is usually more expensive than being invested through a bad one.
Try this today
Set a fixed date each month to invest, and remove the decision.
Test yourself
Someone moves to cash during a downturn, intending to return when things settle. Why is that harder than it sounds?
Show the answer
The strongest days cluster near the worst ones, so exiting to avoid the fall usually means being out for the recovery. Getting back in requires a second correct decision at the point when confidence is lowest, and missing a few of those days removes much of the decade's return.
Learn this in the feed Answering from memory, then again days later, is what makes it stick.