like to thank participants at those seminars, Tiago Mata, and the two referees of this journal for helpful comments on earlier drafts. 2 References to the second edition of Robbins's Essay will be to the 1984 edition. I would like to thanks Wade Hands for providing me with a copy of the first edition of the Essay and for pointing me to some crucial differences between both editions. 500 JOURNAL OF THE HISTORY OF ECONOMIC THOUGHT
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