Hayek's Journey: The Mind of Friedrich Hayek (2003)
“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)
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Walter E. Williams 34
American economist, commentator, and academic 1936Related quotes
1970s, Economics for the Citizen (1978)

" Interview with Eric S. Maskin: Questions by TSE students http://www.tseconomist.com/all-publications/interview-with-nobel-prize-winner-eric-maskin" at tseconomist.com, 04/07/2013; In answer to the question of why he decided to become an economist.

“If you must tell me your opinions, tell me what you believe in. I have plenty of douts of my own.”
In an interview with webmaster of thuytrangtribute.com https://www.thuytrangtribute.com/index.html#phone-message (May 2000)

Speech in Leipzig (4 March 1935), as quoted in The Trial of the Germans : An Account of the Twenty-Two Defendants Before the International Military Tribunal at Nuremberg (1997) by Eugene Davidson, p. 234.

Letter to Lord Lauderdale (18 November 1802), quoted in L. G. Mitchell, Charles James Fox (London: Penguin, 1997), p. 177.
1800s

Vernon L. Smith (2002) in: " Vernon L. Smith - Biographical http://www.nobelprize.org/nobel_prizes/economic-sciences/laureates/2002/smith-bio.html". Nobelprize.org. Nobel Media AB 2013. Web. 13 Jun 2014.
After all control and institutions and processes are immediate things. They can all be translated into terms of human conduct...
Source: The Institutional Approach to Economic Theory, 1919, p. 311-6