LONG-TERM INVESTING

Time horizon

Time horizon is the period before invested money is needed. It determines how much short-term variability is tolerable, and shortening it — by needing the money sooner than planned — changes the risk of a portfolio without changing anything inside it.

The same portfolio is a reasonable holding for money not needed for twenty years and an unreasonable one for money needed in eighteen months. Nothing about the assets differs; the horizon does.

The horizon that quietly collapses

The most common way a long horizon becomes a short one is not a change of plan but a change of circumstances — a job loss, an unexpected bill, an emergency with no cash set against it. This is why an accessible cash buffer is usually described as the first holding rather than a cautious afterthought: it exists so that a market decline and a personal emergency do not have to be resolved on the same day.

Forced selling is the mechanism that converts a temporary decline into a permanent loss. Almost everything about horizon planning is aimed at never being forced.

Related terms

CompoundingCompounding is growth calculated on both the original amount and the gains already accumulated, so returns generate their own returns — and losses compound in exactly the same way, in the opposite direction.Risk toleranceRisk tolerance is the amount of decline an investor can hold through without abandoning their plan. It is a behavioural limit rather than a financial one, and it is routinely overestimated until it is tested.Asset allocationAsset allocation is the decision about what proportion of a portfolio sits in each broad asset class — equities, bonds, cash, and others — and it accounts for far more of a portfolio's variability over time than the selection of individual holdings within those classes.

Maintained by Jared Sinclair, Founder · Syrax Global FZCO · Definitions are educational, not financial advice.

Knowing the vocabulary is the easy part.

Every term here can be learned in an afternoon. Applying them consistently under pressure is the part that decides outcomes — and the part almost nobody measures. That is what the series is about.

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