Kyle would increase his consumption of turkey sandwiches from 7 to 9 per week if their price fell from $6 to $4. This illustrates the idea of<u> the law of diminishing marginal utility.</u>
The introductory economics textbook Principles of Economics was written by N. Gregory Mankiw, a professor of economics at Harvard.
As of 2020, there have been nine editions since its initial release in 1997. Prior to the book's publication, there was debate over the substantial advance author Greg Mankiw received from publisher Harcourt.
More than a million copies have now been sold, bringing in at least $42 million for Mankiw.
Mankiw made the decision to donate the textbook royalties he had been collecting from his students to charity after hearing their concerns about the cost.
Principles of Economics is the required text for introductory courses in American economics departments.
It is the "most commonly used economics textbook," according to its current publisher Cengage.
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