Tyler Cowen and Alex Tabarrok, Modern Principles of Macroeconomics, 3rd ed. (New York, 2014), p. 413.
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Mark Maremont, “EpiPen Maker Dispenses Outsize Pay”, Wall Street Journal, September 13, 2016; and Tara Parker-Pope and Rachel Rabkin Peachman, “EpiPen Price Rise Sparks Concern for Allergy Sufferers”, New York Times, August 22, 2016.