For a monopoly, what is the price effect? Question 4 options: a) The change in total revenue caused by the new customers now paying the old price. b) The change in marginal revenue caused by the new customers now paying the new price. c) The change in total revenue caused by the new customers now paying the new price. d) The change in total revenue caused by old customers now paying the new price. e) The change in marginal revenue caused by old customers now paying the new price.