The technology for using base motives to productive economic effect is reasonably well understood. Indeed, the history of the twentieth century encourages the thought that the easiest way to generate productivity in a modern society is by nourishing the motives of which I spoke earlier, namely, those of greed and fear. But we should never forget that greed and fear are repugnant motives. Who would propose running a society on the basis of such motives, and thereby promoting the psychology to which they belong, if they were not known to be effective, if they did not have the instrumental value which is the only value that they have?