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Case Law vs. Statute Law: An Evolutionary Comparison
Giacomo A. M. Ponzetto CREI - Universitat Pompeu Fabra Patricio A. Fernandez Harvard University June 2007 Journal of Legal Studies, Forthcoming Abstract: Case law develops gradually through the rulings of appellate judges who have heterogeneous preferences but are partially bound by stare decisis. We show that its evolution converges towards more efficient and predictable legal rules. Since statutes do not share this evolutionary property, case law is the best system when the efficient rule is time-invariant, even if the legislature is more democratically representative than individual judges. In the presence of social change, the ideal legal system includes both legislation and judicial decisions as complementary sources of law. Our model thus explains the modern history of common law and the observed cross-country correlation between legal origins and economic outcomes. It also predicts the gradual convergence of civil law and common law towards a mixed system.
Keywords: case law, statute law, precedent, legal evolution, efficient rules JEL Classifications: H11, K40 Working Paper SeriesDate posted: August 07, 2006 ; Last revised: October 04, 2007Suggested CitationContact Information
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