“At the beginning of each semester, I tell students that my economic theory course will deal with positive, non-normative economic theory. I also tell them that if they hear me making a normative statement without first saying, "In my opinion," they are to raise their hands and say, "Professor Williams, we didn't take this class to be indoctrinated with your personal opinions passed off as economic theory; that's academic dishonesty." I also tell them that as soon as they hear me say, "In my opinion," they can stop taking notes because my opinion is irrelevant to the subject of the class -- economic theory. Another part of this particular lecture to my students is that by no means do I suggest that they purge their vocabulary of normative or subjective statements. Such statements are useful tools for tricking people into doing what you want them to do. You tell your father that you need a cell phone and he should buy you one. There's no evidence whatsoever that you need a cell phone. After all, George Washington managed to lead our nation to defeat Great Britain, the mightiest nation on Earth at the time, without owning a cell phone.”

1970s, Economics for the Citizen (1978)