Risk & Allocation
An asset that looks bad alone can still earn its place
Holdings are frequently judged on their own returns, but what an asset contributes to a portfolio depends on how it behaves alongside everything else held.
Individual holdings get assessed in isolation, which is not how they function. An asset's contribution depends on its relationship with the rest of the portfolio.
The isolated view is the natural one
Statements report each holding separately, with its own return. That presentation invites a holding-by-holding verdict, and the worst performer is the obvious candidate for removal.
The judgement feels rigorous because it uses real numbers. What it omits is that the portfolio's behaviour is not the sum of its parts assessed one at a time.
An asset that lagged may have moved differently from everything else, which is a contribution that does not appear anywhere in its own return figure.
Combination changes the outcome
Two holdings that move differently produce a combined result that is steadier than either. The steadiness comes from the relationship, not from the individual performances.
This is why an asset with modest returns and different behaviour can improve a portfolio more than one with better returns that moves like everything already held.
The improvement is easiest to see over long periods and hard to see in any single year, which is when the removal decisions are usually taken.
Relationships are not fixed
How assets move relative to each other changes over time and tends to change most in stressed periods, when things that normally diverge start moving together.
That instability limits how much weight the relationship can bear. A portfolio built entirely on assets behaving differently is relying on something that varies.
It is a reason to hold genuinely different kinds of asset rather than many holdings that are technically distinct and economically similar.
The uncomfortable holding is doing its job
In any diversified portfolio something is always performing poorly relative to the rest. If nothing is, the holdings are probably more alike than intended.
The persistent laggard is therefore evidence the portfolio is diversified rather than evidence of a mistake, which is a difficult thing to hold on to over several years.
Removing it produces a portfolio that looks better in review and behaves worse in the conditions the holding was there for.
Judging at the portfolio level
The reviewable question is whether the portfolio as a whole remains suited to the goal and horizon. That question does not require ranking the holdings against each other.
Where a holding does need removing, the reason should be something structural, such as a change in what it holds or in its charges, rather than its recent return.
Writing the reason for holding each asset at the point of purchase makes this tractable later, because the test becomes whether the reason still applies.
Questions readers ask
Is a target date fund a good default?
For somebody who would otherwise never adjust anything, it does a job that would not otherwise get done. It is weaker where a lot of your wealth sits outside it.
What does to versus through mean?
Whether the fund stops adjusting at the target date or continues reducing risk for years afterwards. The two produce quite different allocations on the day you retire.
