1999. The Questionable Empirical Basis of Article 2's Incorporation Strategy: A Preliminary Study, 66 University of Chicago Law Review (1999) 710-780 = Berkeley Olin Program in Law & Economics, Working Paper Series, Paper 26 (20 January 1999) <> [Commentary on the "incorporation principle" expressed in UCC sections dealing with course of dealing, usage of trade, and course of performance. Lead sentence: "The UCC, the CISG and the modern Lex Mercatoria are based on the premise that unwritten customs and usages of trade exist and that in commercial disputes they can, and should, be discovered and applied by courts."]