Textbook Economics
A student asks an intriguing question about what happens when professors sell the free examination copies of textbooks they get from publishers:
Dear Professor Mankiw,
I am an undergraduate student currently taking a course on Principles of Microeconomics. The required textbook for the course is the fourth edition of your Principles of Microeconomics, which I have immensely enjoyed reading.
However, a NOT FOR SALE note on the back cover of the instructors edition of the book caught my eyes when I happened to see it on my professor's desk. The note reads: