The O-Ring Theory of Economic Development
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
Michael Kremer’s 1993 model of economic development describes production with strongly complementary tasks: output depends on the product of task qualities, rather than average worker ability or simply the minimum quality. Under its assumptions, it implies positive assortative matching of workers with similar skill levels and helps explain differences in productivity, firm size, and income. Its name refers to the Challenger O-ring disaster.
SCAFFOLDING EFFECT
Reduce cognitive load
Check whether tasks in a specific deliverable are complementary: does low quality in one task reduce the return to improving the others? Use that analysis to compare process quality, training, and staffing options; seniority alone does not identify a worker who will destroy team output.
Anchor fast decisions
A simplified production function is B×q₁×q₂×…×qₙ, where q represents task quality or success and B captures production scale and related factors. The marginal return to improving one task rises with the quality of the others, producing skill complementarity and positive assortative matching. A chain of 100 tasks with 99% success each has success probability 0.99¹⁰⁰≈36.6% only if successes are independent and all tasks must succeed. Correlated failures, rework, and redundancy change this calculation.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/O-ring_theory_of_economic_developmentverified
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