13. When a monopolist lowers its price from $80 to $70, the quantity it is able to sell increases from 100 to 150. The change in revenue associated with the output effect is equal to: a. $3,500. b. -$3,500. 0. $500. (1. -$500. e. $4,000. 14. When a monopolist lowers a price from $80 to $70, the quantity that the rm is able to sell increases from 100 to 150. The change in revenue associated with the price effect is equal to: a. $3,500. b. -$3,500. c. $1,000. (1. -$1,000. e. $4,000