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Beyond the Precautionary Principle


Cass R. Sunstein


Harvard Law School

January 2003

U Chicago Law & Economics, Olin Working Paper No. 149; U of Chicago, Public Law Working Paper No. 38

Abstract:     
The precautionary principle has been highly influential in legal systems all over the world. In its strongest and most distinctive forms, the principle imposes a burden of proof on those who create potential risks, and it requires regulation of activities even if it cannot be shown that those activities are likely to produce significant harms. Taken in this strong form, the precautionary principle should be rejected, not because it leads in bad directions, but because it leads in no directions at all. The principle is literally paralyzing - forbidding inaction, stringent regulation, and everything in between. The reason is that in the relevant cases, every step, including inaction, creates a risk to health, the environment, or both. This point raises a further puzzle. Why is the precautionary principle widely seen to offer real guidance? The answer lies in identifiable cognitive mechanisms emphasized by behavioral economists. In many cases, loss aversion plays a large role, accompanied by a false belief that nature is benign. Sometimes the availability heuristic is at work. Probability neglect plays a role as well. Most often, those who use the precautionary principle fall victim to what might be called "system neglect," which involves a failure to attend to the systemic effects of regulation. Examples are given from numerous areas, involving arsenic regulation, global warming and the Kyoto Protocol, nuclear power, pharmaceutical regulation, cloning, pesticide regulation, and genetic modification of food. The salutary moral and political goals of the precautionary principle should be promoted through other, more effective methods.

Number of Pages in PDF File: 49

Keywords: burden of proof, behavioral economics

working papers series


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Date posted: May 2, 2002  

Suggested Citation

Sunstein, Cass R., Beyond the Precautionary Principle (January 2003). U Chicago Law & Economics, Olin Working Paper No. 149; U of Chicago, Public Law Working Paper No. 38. Available at SSRN: http://ssrn.com/abstract=307098 or http://dx.doi.org/10.2139/ssrn.307098

Contact Information

Cass R. Sunstein (Contact Author)
Harvard Law School ( email )
1575 Massachusetts Ave
Areeda Hall 225
Cambridge, MA 02138
United States
617-496-2291 (Phone)
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