Microeconomics 13th Edition by Russell Sobel, David Macpherson, Richard Stroup, James Gwartney

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What explains lie earnings differences between (a) a lawyer and a minister; (b) an accountant and an elementary school teacher; (c) a business executive and a social worker; (d) a country lawyer and a Wall Street lawyer; (e) an experienced, skilled craftsperson and a twenty-year-old high school dropout; and (f) an upper-story and a ground-floor window washer?