1. Soup is an inferior good if the demand a. for soup falls when the price of a substitute for soup rises. b. for soup rises when the price of soup falls. c. curve for soup slopes upward. d. for soup falls when income rises. 2. Equilibrium price must increase when demand a increases and supply does not change, when demand does not change and supply decreases, and when demand decreases and supply increases simultaneously. b. increases and supply does not change, when demand does not change and supply decreases, and when demand increases and supply decreases simultaneously. c. decreases and supply does not change, when demand does not change and supply increases, and when demand decreases and supply increases simultaneously. d. decreases and supply does not change, when demand does not change and supply increases, and when demand increases and supply decreases simultaneously. 3. How does the concept of elasticity allow us to improve upon our understanding of supply and demand? a. Elasticity allows us to analyze supply and demand with greater precision than would be the case in the absence of the elasticity concept. b. Elasticity provides us with a better rationale for statements such as "an increase in x will lead to a decrease in y" than we would have in the absence of the elasticity concept. c. Without elasticity, we would not be able to address the direction in which price is likely to move in response to a surplus or a shortage. d. Without elasticity, it is very difficult to assess the degree of competition within a market.