
Originál: (en) Economics as a positive science is a body of tentatively accepted generalizations about economic phenomena that can be used to predict the consequences of changes in circumstances.
Zdroj: [Friedman, Milton, The Methodology of Positive Economics, Univ. of Chicago Press, Chicago, 1966, https://web.archive.org/web/20081118134352/http://mikael.cozic.free.fr/friedman53%28extraits%29.pdf, 39]