In his book The Concept of Law H. L. A. Hart observes that the law must refer to broad classes of persons or classes of acts, things or circumstances. This observation is not entirely original; both Plato and Aristotle also note that laws are general rules that apply to large groups of actions or persons. Plato in the Politicus (295a) compares legislators to trainers who "When they lay down rules for physical welfare, find it necessary to give bulk instructions having regard to the general benefit of the average pupil. " In the same way the legislator "will legislate for all individual citizens, but it will be by what may be called a "bulk " method rather than individual treatment. " Aristotle in the Politics...