The following graph depicts the demand (D), marginal revenue (MR), marginal cost (MC), and average total cost (ATC) curves for a firm operating as a natural monopoly.
Market for a Natural Monopoly
80
70
Costs and Revenues (dollars)
60
50
40
30
20
10
0
10 20 30 40 50 60 70 80 90 100
MC
ATC
D
MR