Textbook Erratum

An alert student at the U.S. Military Academy has identified an error in the new (4th) edition of my principles textbook (the only one, as far as I know):

I just wanted to inform you that I found a mistake in the textbook. It's in Chapter 9 (Application: International Trade). On page 185, there is a table in Figure 4 where above the columns is written "Before Trade", "After Trade," and "Change". I think the author wanted to say "Before Tariff" and "After Tariff."

The student is correct. Current users of the text should take note. I have alerted the publisher, and the error will be corrected in the next print run.