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On Practices and the Law


Mark Greenberg


UCLA School of Law and Department of Philosophy


Legal Theory, Vol. 12, Forthcoming
UCLA School of Law Research Paper No. 05-25

Abstract:     
In a recent paper, "How Facts Make Law," I launch an attack on a fundamental doctrine of legal positivism. I argue that non-normative facts cannot themselves constitutively determine the content of the law. In a response published in this journal, Ram Neta defends the view that non-normative social facts are sufficient to determine normative facts, including both moral and legal facts. Neta's paper provides a useful opportunity to address a spelled-out version of this view, which in various forms is widely held in philosophy of law and other areas of philosophy.

I begin by addressing Neta's attempts to show that descriptive facts can alone determine moral and legal facts. First, Neta's account of why it is wrong to break promises fails. In addition to other problems, it begs the question by taking for granted that a person's desires or other motivational states necessarily justify the actions that they motivate. Next, I turn to Neta's attempt to provide a counterexample to my view about law. In my original paper, I claim that the nature of the constitutive determination relation in the legal domain is what I call rational determination. Roughly speaking, a full constitutive account of the legal facts must include reasons that explain the relation between the determining facts and the legal facts. The facts on which Neta's putative counterexample depends cannot be reasons of the required sort because they take for granted what they are supposed to explain - the way in which non-normative social facts contribute to the content of the law. Finally, I address the larger issue of how far my argument applies to other domains. I consider and reject Neta's argument that purports to show that all normative domains have the relevant features of the legal domain. I then sketch a competing picture of some normative domains.

Number of Pages in PDF File: 36

Keywords: Legal positivism, philosophy of law, normativity, practices, reasons, promises, promising, norms, obligations, morality, normative reasons, motivating reasons, moral truths, legal norms, institutions

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Date posted: September 13, 2005  

Suggested Citation

Greenberg, Mark, On Practices and the Law. Legal Theory, Vol. 12, Forthcoming; UCLA School of Law Research Paper No. 05-25. Available at SSRN: http://ssrn.com/abstract=802826

Contact Information

Mark Greenberg (Contact Author)
UCLA School of Law and Department of Philosophy ( email )
385 Charles E. Young Dr. East
Room 1242
Los Angeles, CA 90095-1476
United States
(310) 206-1337 (Phone)
(310) 825-6023 (Fax)
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