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55 U. Kan. L. Rev. 629 (2006-2007)
Law and Economics after Behavioral Economics

handle is hein.journals/ukalr55 and id is 639 raw text is: Law and Economics After Behavioral Economics
Grant M Hayden* & Stephen E. Ellis**
1. INTRODUCTION
Economic theory is a sort of distilled common sense: it draws out the
implications of the view that people act to best get what they want, given
what they believe about their circumstances. That basic insight is used to
build mathematical models that are intended to explain and predict
human behavior.      Those models are useful in many          ways-most
centrally, they allow us to structure incentives in order to achieve
important ends.' Structuring incentives on any kind of large scale is a
job for governments, and the tool they use is the law. Thus, it should
come as no surprise that lawmakers have looked to economic theory for
guidance. And, indeed, the law and economics movement has become,
by almost any measure, the most dominant school of legal thought in the
last half a century.2
But there is sufficient reason to conclude that economic theory, as it
stands, is flawed. While economic models have had their successes, a
large and growing body of empirical evidence reveals that people often
fail to live up to the rational-actor ideal of standard economics.3 Real
people, it turns out, use mental shortcuts. They display systematic biases
when they make judgments. And they occasionally take actions that
conflict with their interests, in both the long and short term. As a result,
Professor of Law, Hofstra Law School. J.D. Stanford Law School. The authors would like
to thank Alafair Burke, John Gregory, Chris Guthrie, Russell Korobkin, Greg Mitchell, and Jeff
Rachlinski for their helpful comments on earlier drafts of this work.
.. Assistant Professor of Philosophy, University of Oklahoma. Ph.D. Rutgers University.
I. There is some debate about what those ends should be. Normally, we try to maximize
people's ability to get what they want, on the assumption that they know their own needs. In certain
cases, however, we seek to discourage the pursuit of certain ends, e.g., heroin-induced stupors.
2. E.g., Francesco Parisi, Introduction to THE ECONOMIC STRUCTURE OF THE LAW: THE
COLLECTED ECONOMIC ESSAYS OF RICHARD A. POSNER, at ix, xxxii (Francesco Parisi ed., 2000);
Thomas S. Ulen, A Crowded House: Socioeconomics (and Other) Additions to the Law School and
Law and Economics Curricula, 41 SAN DIEGO L. REV. 35, 36 (2004). See generally RICHARD A.
POSNER, ECONOMIC ANALYSIS OF LAW (6th ed. 2003) (applying economic theory to virtually every
field of law); STEVEN SHAVELL, FOUNDATIONS OF ECONOMIC ANALYSIS OF LAW (2004) (same).
3. See infra Parts IIB, III.A (discussing this failure and the emergence of behavioral
economics).

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