This article is a revised version of a paper delivered at the 33rd Annual Workshop on Commercial and Consumer law, held at the Faculty of Law of the University of Toronto. It is a commentary on Stephen Waddams, Dimensions of Private Law: Categories and Concepts in Anglo-American Legal Reasoning (Cambridge, Press 2003). The article first reviews Waddams\u27 thesis of the inadequacy of simple explanations or categorizations of private law and Waddams\u27 admonition to avoid labeling cases such as contract or tort, as if one involves solely enforcing agreements and the other only wrongdoing. The article then goes on to analyze questions inspired by Waddams\u27 book: What accounts for the popularity of conceptualizing private law? What ar...