The Methodology of Positive Economics

Milton Friedman, "The Methodology of Positive Economics," in Essays in Positive Economics, University of Chicago Press (1953), 1970, pp. 3-43
http://members.shaw.ca/compilerpress1/Anno%20Friedman%20Positive.htm

Economist's View: Milton Friedman: The Methodology of Positive Economics
http://economistsview.typepad.com/economistsview/2006/11/milton_friedman_2.html より