Tragedy of the Commons

Overview

When a shared resource has individual access but no individual responsibility for preservation, rational users extract private benefit while the cost of overuse is shared — leading to collective degradation. Garrett Hardin named this in 1968; Elinor Ostrom corrected it in 1990 (Nobel 2009): many communities self-govern commons via her 8 design principles without privatization or coercion.

Composes with prisoners-dilemma, principal-agent, network-effects, goodharts-law, repeated-games-reputation.

When to Use

• Diagnosing why a shared resource is degrading (open-source burnout, API abuse, attention market polarizing)
• Assessing AI-era shared-resource strain from AI capex and AI-native competition (open web scraped for training data, grid/power capacity, GPU allocation)
• Designing platforms, marketplaces, shared infrastructure, API quotas, or rate limits
• Designing workplace norms around shared resources (meetings, Slack, email)
• Evaluating regulatory or policy responses to shared-resource problems

Not when: resource is genuinely non-rival; fully private; "commons" framing is misapplied to individual-action problems.

Coaching Novices (Adaptive Front Door)