A serious problem with U.S. antitrust law today is that big monopolistic firms like Amazon.com Inc. are wielding too much economic power, but general counsel and their companies hold a key to changing that, according to antitrust expert Christopher Sagers.

Sagers, an author and professor at Cleveland–Marshall College of Law, has written a new book, “United States v. Apple: Competition in America” under Harvard University Press on sale Sept. 19. The book is a study of the 2014 e-books price-fixing case involving Apple Inc. and five publishers in an effort to break up Amazon’s dominance in the market.

United States v. Apple, by Christopher Sagers.