Path Dependence

Path dependence concerns persistent effects of history on present possibilities or later outcomes through specified mechanisms. Different histories can generate different accumulated states or selected outcomes; persistence alone does not establish inefficiency or irreversible lock-in.

Path dependence asks whether different histories leave persistent differences in possibilities or outcomes under otherwise comparable conditions. The mechanism may involve accumulated skills, complementary investments, institutions, or reinforcement. A historical explanation should identify what remains from the past and how it affects present transitions, rather than merely noting that events happened in a sequence.

Distinguish costs already incurred from consequences that still matter. Past spending alone does not justify continuing, but a present installed system, trained team, or compatibility requirement can change the real cost of switching. Assess alternatives from the current situation and test whether the dependency can be reduced. Historical persistence does not establish inferiority, permanence, or a need to break the path.

When to use it

When a present choice differs from choosing afresh because prior events created enduring assets, constraints, or feedback effects.

How it can help

Trace how earlier events affect present skills, assets, compatibility, incentives, or institutions. Compare feasible future choices while separating sunk costs from real current switching costs and valuable accumulated capabilities.