This essay first appeared in the 4000-page International Encyclopedia of the Social Sciences, 2nd edition, 9 vols., edited by William A. Darity, Jr. (Detroit: Macmillan Reference USA, 2008, Volume 6: Oaxaca, Ronald - Quotas, Trade, pp. 6-8).
It was posted as a Notablog entry on 18 January 2008.
By Chris Matthew Sciabarra
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