The figure given below shows a situation where the producers of good X are forming an international cartel. Here, MR = Marginal Revenue, MC = Marginal Cost, and P = Price. The cartel use monopoly pricing for its output. Price ( dollars per unit ) 0 300 500 600 1,000 1,500 MC curve of cartel (= supply curve if there is perfect competition) Demand MR Quantity (Millions of units ) 100 150 A declining market share of the cartel would lead to a : a. rightward shift of the cartel marginal cost curve and a rise in cartel output . b. rightward shift of the cartel demand curve and a fall in output . c. leftward shift of the cartel marginal cost curve and a rise in output . d. leftward shift of the cartel demand curve and a fall in cartel output .