Diversification is a question of exposure, not quantity

Look beneath the labels

Diversification is often described as spreading investments across different assets. The useful question is what those assets depend on. Several funds can hold many of the same securities. Businesses in different sectors may rely on the same customers, financing conditions or commodity prices.

Counting holdings therefore provides only a partial picture. Understanding the economic exposures behind them can be more informative. A portfolio with fewer, deliberately complementary exposures may behave differently from a larger collection assembled without an overall plan.

Consider the whole financial picture

Investments do not sit apart from the rest of a financial life. A business owner whose income and capital are tied to one industry may already have a significant concentration before selecting any listed investments. Property, future spending and the currency of income can also influence the picture.

This broader view does not lead automatically to a single allocation. It helps identify which exposures are already present, which risks may be acceptable and which decisions deserve closer examination.

Correlation changes with conditions

Relationships between investments are not fixed. Assets that appear to behave differently in ordinary periods may fall together when liquidity is constrained or investors reassess risk. Historical data describes an observed period; it does not establish a permanent relationship.

Scenario analysis can supplement historical measures. Ask what might happen if borrowing costs rise, a major currency moves sharply or an asset cannot be sold when expected. The exercise is useful because it makes assumptions visible, not because it predicts the future precisely.

A practical review framework

Begin with objectives and obligations. Then assess concentrations across asset classes, issuers, industries, geographies and currencies. Consider liquidity and the costs of changing an allocation. Document the reasons for the chosen balance and the circumstances that would prompt a review.

Diversification cannot eliminate market risk or guarantee a profit. Its role is to help avoid depending unnecessarily on a narrow set of outcomes, within a portfolio whose risks are understood and consistent with its purpose.