A 6. If the price of a substitute to good X increases, then a. the demand for good X will increase. b. the market price of good X will decrease. C. the demand for good X will decrease. d. the demand for good X will not change. 7. A supply curve slopes upward because a. an increase in price gives producers incentive to supply a larger quantity. b. an increase in input prices increases supply. C. a decrease in input prices decreases supply. d. as more is produced, per unit costs of production fall. 8. If a decrease in income increases the demand for a good, then a. the good is a substitute good. b. the good is a complement good. C. the good is a normal good. the good is an inferior good