Law And Economics
Economic Analysis Of Law
This guide helps you get your bearings in Economic Analysis Of Law before you start exploring the interactive timeline, framework graph, and concept maps.
Before You Dive In
- Economic analysis of law applies microeconomic theory to legal rules and institutions — it asks whether legal rules are efficient and how they affect incentives.
- The field was launched by Coase's theorem (1960) and consolidated by Posner's "Economic Analysis of Law" (1973) — these remain the essential starting points.
- The Chicago School (Posner, Becker) emphasizes efficiency as the primary criterion for evaluating legal rules; the Yale School (Calabresi) gives more weight to distributional concerns.
- Behavioral law and economics (Sunstein, Jolls, Thaler) challenged the rational actor assumption from the 2000s onward, incorporating cognitive biases into legal analysis.
- The field is controversial: critics argue that reducing law to efficiency ignores justice, rights, and democratic values.
Key Terms to Know
Coase theoremIn the absence of transaction costs, the initial allocation of legal rights does not affect the efficient outcome — parties will bargain to it regardless.
EfficiencyIn law and economics, typically Kaldor-Hicks efficiency: a legal rule is efficient if winners could in principle compensate losers.
Transaction costsCosts of negotiating, drafting, and enforcing agreements — when high, the initial legal rule matters for efficiency.
ExternalityA cost or benefit imposed on third parties not involved in a transaction — a primary justification for legal intervention.
Optimal deterrenceSetting legal penalties at the level that minimizes the total social cost of harmful conduct plus enforcement.
Common Confusions
Thinking the Coase theorem says law doesn't matter — it says law doesn't matter only when transaction costs are zero, which they almost never are in practice.
Assuming law and economics is politically libertarian — the method can justify extensive regulation when markets fail, and the Yale School explicitly weighs fairness.
Confusing positive analysis ("what effects does this rule have?") with normative analysis ("should we adopt this rule?") — economic analysis can inform both but they are distinct questions.
Recommended Reading
Economic Analysis of Law— Richard A. Posner
1973The Cost of Accidents: A Legal and Economic Analysis— Guido Calabresi
1970Foundations of Economic Analysis of Law— Steven Shavell
2004How to Use the Interactive View
1
Explore the timeline
Open the interactive view and scan the framework timeline. Which frameworks came first? Which ones overlap? Where are the big transitions?
2
Read the articles
Click into individual frameworks to read what each one claims, where it came from, and how it relates to its neighbors.
3
Check the concept map
See how the key ideas within a framework connect. This is useful for figuring out what to learn first and what depends on what.
4
Test yourself
Take the quiz for any framework you've read about. It's a quick way to find out whether you actually understood the core ideas or just skimmed them.