How Tax Models Work
Sarah B. Lawsky
University of California - Irvine School of Law
November 25, 2012
Boston College Law Review, Vol. 53, 2012
UC Irvine School of Law Research Paper No. 2012-76
Unlike many social and physical sciences, legal scholarship includes little or no discussion of what models mean, how they are connected to the real world of law and policy, or how they should, and should not, be used by legal scholars. This void exists notwithstanding legal scholarship’s increasing reliance on explicit modeling in fields such as law and economics. This article uses the example of economic modeling in tax scholarship to investigate how legal scholarship uses models, and how models in legal scholarship work. The article lays out a path between two extremes. At one extreme is scholarship that employs models without either reflection or self-consciousness to make real-world recommendations; at the other is scholarship that rejects models because their assumptions are too far from reality. This article argues that neither approach is correct. Models are useful and important for legal scholarship, but not in the way that some critics and proponents seem to believe. Drawing from literature in the philosophy of science, this article argues that we reason from economic models through a mix of deductive and ampliative logic, through leaps, creativity, and intuition. Models cannot provide certainty about what the law should be; rather, economic models are merely one kind of voice in an ongoing and necessarily inconclusive conversation. This article concludes by drawing on this deeper understanding of models and modeling to propose ways that legal scholarship can and should use economic models.
Number of Pages in PDF File: 39
Keywords: tax, modeling, philosophy, law and economics
JEL Classification: A12, B41, H20, K00, K34
Date posted: November 25, 2012 ; Last revised: November 30, 2012
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