The Expressive Powers of Law: Theories and Limits

Richard H. McAdams (University of Chicago). The Expressive Powers of Law: Theories and Limits (Harvard University Press, 2015).

"People seek order, and they sometimes obtain a mutually shared benefit when each expects the other to behave in accordance with law. Traffic regulations, for example, coordinate behavior by expressing an orderly means of driving. A traffic sign that tells one driver to yield to another creates expectations in the minds of both drivers and so allows each to avoid collision. McAdams generalizes from traffic to constitutional and international law and many other domains. In addition to its coordinating function, law expresses information. Legislation reveals something important about the risks of the behavior being regulated, and social attitudes toward it. Anti-smoking laws, for example, signal both the lawmakers’ recognition of the health risks associated with smoking and the public’s general disapproval. This information causes individuals to update their beliefs and alter their behavior.

McAdams shows how an expressive theory explains the law’s sometimes puzzling efficacy, as when tribunals are able to resolve disputes even though they lack coercive power or legitimacy. The Expressive Powers of Law contributes to our understanding of the mechanisms by which law—simply by what it says rather than what it sanctions—generates compliance."


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