When, on my teacher training course, I was told I had create a resource to be used in school, I thought it would be fun to devise a programmed learning guide to the economic concepts of absolute and comparative advantages. Unfortunately, that was in 1974. Word processors were not yet ubiquitous, and home computers had not yet been invented. That came a year or two later. In any case, when I finally did get my hands on a word processor, courtesy of a friend of mine on my MA course, it was slo-o-o-o-o-w.