The North method took only a few hours. Contrast this with Dr. South's automobile-purchasing crusade--a process that took him at least sixty hours. And, of course, Dr. North likes to keep his cars for a long time. So his allocation of purchasing time is spread over several years. On average, he devotes less than an hour a year to purchasing motor vehicles. But Dr. South likes to buy a new car every year. Thus, his sixty-hour project is typically allocated to only one year. FEARS