The demand curve for gasoline slopes downward and the supply curve for gasoline slopes upward. the production of the 1,000th gallon of gasoline entails the following: • a private cost of $3.10; • a social cost of $3.55; • a value to consumers of $3.70.onepixel. gifrefer to scenario 10-1. let q represent the number of gallons of gasoline and let p represent the price of a gallon of gasoline. which of the following statements is correct? a. one point on the supply curve is (q = 1,000, p = $3.10). b. one point on the social-cost curve is (q = 1,000, p = $0.45). c. one point on the demand curve is (q = 1,000, p = $3.55). d. the socially optimal quantity of gasoline is less than 1,000 gallons.