An investor we met some years ago had a remarkable record of being busy. He switched funds when one lagged, booked profits when markets rose, moved to cash when the news turned grim, and bought back when confidence returned. He did this for a decade, with intelligence and conviction. When we finally mapped it all out, he had underperformed the very funds he had owned the whole time — by a wide margin. Not because the funds failed him. Because he could not sit still.

His story is the rule, not the exception. Across full market cycles, the average investor reliably earns less than their own investments, and the gap has a single main cause: activity.

Most of the damage done to a portfolio is not done by the market. It is done by the investor, in the act of trying to help.

Why ‘doing something’ quietly costs you

Every move carries three tolls. A transaction cost. A tax event — often crystallising gains you needn’t have. And the silent one: the risk of being out of the market on exactly the days that matter. The largest up-days cluster unpredictably, frequently right after the most frightening down-days — so the investor who sells to feel safe tends to buy back higher, having paid for the privilege of missing the recovery. Multiply that across decades and ‘doing something’ becomes one of the most expensive habits a portfolio can carry.

What we do instead

We do the hard thinking once, at the start — the right mix of assets for your goals and your temperament — and then we protect that decision from the noise, and from ourselves. We rebalance on a rule, not a mood: when an allocation drifts past a set band, we nudge it back, which mechanically trims what has run and adds to what has lagged. Otherwise, we wait. We ignore the forecasts that are engineered to make you trade. This is not laziness; it is the discipline the evidence rewards.

The two times we do act

Stillness is not paralysis, and there are exactly two moments that earn a change. The first is mechanical: when an allocation drifts past its band, we rebalance — a rule, not a forecast. The second is personal: when your life changes — a goal arrives, a need shifts, your real capacity for risk moves — the plan should move with it. What never earns a change is a headline, a tip, or the simple discomfort of a falling market.

Patience feels passive precisely because it is hard. But it is a strategy, not the absence of one. We can’t control the markets; we can control how often we get in their way. In twenty years, the portfolios that compounded best were rarely the cleverest. They were the least disturbed.