Path Dependence and Lock-In
Early choices can shape later options, even when alternatives might be better now.
The Mechanism: Path dependence describes how the sequence of past events shapes current options. Early choices can create infrastructure, habits, and complementary investments that make one route increasingly costly to leave.
The Philosophical Pivot: What persists may not be what is best in the present. A system can become locked into an arrangement because changing it would require coordination and transition costs, not because it remains optimal.
The Horizon: Path dependence helps explain technologies, institutions, and urban development. It should not be invoked to imply that history makes change impossible; policies and shocks can reopen choices.
Past decisions may have been sensible under earlier conditions. Criticizing today's outcome does not prove that earlier actors were foolish or that another path was clearly available.
Lock-in can benefit people who invested in the established system while shifting the cost of transition onto newcomers or the public.
Understanding the path reveals which dependencies must change before a different future becomes practical.
A system can keep choosing its past long after the reasons for that choice have disappeared.
Which inherited arrangement do I call inevitable because changing it now would expose the cost of earlier choices?