Opportunity cost (Simple English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Opportunity cost" in Simple English language version.

refsWebsite

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1books.google.com

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books.google.com

McConnell, Campbell; Stanley L. Brue (2005). Microeconomics: principles, problems, and policies. McGraw-Hill Professional. p. 27. ISBN 0072875615.

nytimes.com

Frank, Robert H. 2005. The opportunity cost of economics education