Edge 59 The problem is that every time a student takes a course because he has to, he finds himself faced with a serious motivation problem. If you don't know why you need to know something it is difficult to learn it and what you learn won't stay in memory for long. If we don't use something, or at least see how we might use it, it is difficult to retain it. A course in calculus may well be useful for an economist, but since the actual course likely has very little to do with economics and the calculus that would eventually be used by the economist, the student will have trouble caring about or retaining what he learned. If he never uses what he learns, he'll forget it entirely.