Defining downside before defining upside
Return targets are easy to state and impossible to enforce. Loss limits are the reverse.
Key takeaways
- Distinguish volatility, drawdown and permanent impairment; only the last is unrecoverable.
- Define the loss you will accept before the return you would like.
- Pre-commit the response to each scenario while the decision is still cheap.
Investors commonly begin with a required return and work backwards to the risk needed to achieve it. This produces portfolios calibrated to ambition rather than to capacity. Reversing the sequence — establishing the maximum tolerable loss first, then asking what return is achievable within it — produces a portfolio that can actually be held.
Three different losses
- Volatility: fluctuation in quoted value. Uncomfortable, usually irrelevant to a long-horizon investor with no forced sale.
- Drawdown: a decline from a peak that must be endured and eventually recovered. Costly in time and in behaviour.
- Permanent impairment: capital that will not return — a failed business, a leveraged position closed out, a structure that could not be exited. The only category that is genuinely fatal.
Conflating these leads to two errors in opposite directions: treating ordinary volatility as danger and de-risking at the worst moment, or treating genuine impairment risk as noise because a chart has recovered before.
Scenarios written as sentences
Useful scenario work is narrative before it is numerical. Describe the world in plain language — funding becomes expensive and stays expensive; a concentrated holding halves and does not recover; income stops for eighteen months — then ask what the portfolio and the household do in that world. The numbers follow, and they are less important than the identified pressure points.
The purpose of a scenario is not to predict it. It is to decide, in advance, what you would do in it.
Pre-committed responses
For each scenario, the response should be recorded before the scenario occurs: what is sold, in what order, what is deliberately not sold, and what liquidity is drawn on first. Decisions made in advance are made by the investor's judgement. Decisions made during the event are made by the event.
Once downside is defined and defended, upside can be pursued honestly. The return that remains available inside real constraints is usually lower than the one first hoped for — and considerably more likely to be realised.