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1. Heyne, Paul; Boettke, Peter J.; Prychitko, David L. (2014). The Economic Way of Thinking (13th ed.). Pearson
2. Robbins, Lionel (2014) [1932]. An Essay on the Nature and Significance of Economic Science (2nd ed.). London: Macmillan. p. 16.
3. A. Tucker, Jeffrey; Kinsella, Stephan. “Goods, scarce and nonscarce”. Mises. Retrieved 25 Aug 2010.
2. Robbins, Lionel (2014) [1932]. An Essay on the Nature and Significance of Economic Science (2nd ed.). London: Macmillan. p. 16.
3. A. Tucker, Jeffrey; Kinsella, Stephan. “Goods, scarce and nonscarce”. Mises. Retrieved 25 Aug 2010.