Over-reliance on a small number of key relationships creates fragility that diversification of relationships is designed to prevent.
The Concentration Dynamic
Professional and institutional relationships naturally concentrate over time. The relationships that produce the most value — the partners who deliver most reliably, the clients who account for the most revenue, the colleagues who contribute most significantly to outcomes — attract proportionally more investment. The relationships that produce less value receive less investment, become less functional, and eventually lapse. The result is a portfolio of relationships that is systematically concentrated in the highest-value relationships and systematically sparse everywhere else.
This concentration is individually rational and structurally risky. The relationship portfolio that is concentrated in a small number of high-value relationships is more efficient in normal conditions — more of the relationship investment is directed toward high-return relationships, and less is spent on maintaining relationships that produce lower returns. It is also more fragile in adverse conditions — the disruption of any single high-value relationship has a disproportionate impact on the portfolio's total value, and the sparse lower-value relationships provide insufficient backup when the high-value ones are unavailable.
Where Concentration Risk Manifests
Concentration risk in relationships manifests most visibly in three contexts. The organisation that depends on a small number of clients for most of its revenue faces existential exposure when those clients depart — exposure that the organisation often cannot see clearly because the concentration that created it was the result of the same success that made it feel secure. The professional whose institutional influence depends primarily on a relationship with a single senior sponsor faces the collapse of that influence when the sponsor departs — and discovers that the relationships they needed to maintain independently were not maintained because the sponsor's backing made them seem unnecessary. The institution whose operational capability depends on a small number of key individuals discovers the extent of its concentration when those individuals become unavailable.
Managing the Concentration
Concentration risk management in relationships requires deliberate investment in relationships that are not currently the highest-value ones — investment that is individually irrational in the short term because it directs resources toward relationships that produce less immediate return. This investment is justified by its optionality value: the relationship that is not the primary source of value in normal conditions becomes the most valuable asset in the portfolio when the primary relationships become unavailable. The institution that maintains a diversified relationship portfolio pays a modest efficiency cost in normal conditions for substantial resilience in adverse ones.
The relationship portfolio concentrated in a few high-value dependencies is maximally efficient and maximally fragile. Diversification is not the rejection of the high-value relationships — it is the insurance that makes it safe to rely on them.
Discussion