Price and total revenue move in opposite directions when demand is inelastic

The landmark antitrust case which established that size alone can be an antitrust violation is the

a. U.S. Steel case b. Brown Shoe case c. Von's Grocery case d. ALCOA case e. Pabst Brewing case

Which of the following is a distinguishing characteristic of the oligopoly market structure?

a. easy entry b. difficult entry c. many, many firms d. many, many close substitutes e. firms's horizontal demand curves