In Order to Prove That Motrin and Ibuprofen Are Substitutes

Multiple Choice

In order to prove that Motrin and Ibuprofen are substitutes, one should measure the ________ and get a ________.

A) cross-price elasticity; positive number
B) cross-price elasticity; negative number
C) price elasticity of demand; number greater than 1 (in absolute value)
D) price elasticity of demand; number less than 1 (in absolute value)