Cumulative Advantage

Cumulative advantage is the process by which small initial differences in resources, position, or opportunity compound over time through positive feedback loops, producing large and often irreversible disparities. It is the dynamic engine behind the Matthew effect, the structural mechanism that makes preferential attachment visible as inequality, and the reason why systems that appear fair in the short term can become systematically biased in the long term.

Cumulative advantage operates not through deliberate discrimination but through the mathematical inevitability of compounding: a system that rewards present position will amplify past advantage regardless of current merit. The result is that historical accidents become structural facts, and the system's output increasingly reflects its history rather than its inputs.