The following shows the demands and marginal revenue in two markets (D1 and MR1, and D2 and MR2) for a price discriminating firm along with total demand, DT, marginal revenue, MRT, and marginal cost MC.

1. The following shows the demands and marginal revenue in two markets (D1 and MR1, and D2 and MR2) for a price discriminating firm along with total demand, DT, marginal revenue, MRT, and marginal cost MC. 350 325 300 D2 275 250 MR2 225 MC 200 175 D1 DT 150 MR1 125 ...................................... ........................................... MRT 100 75 50 25 0 0 100 200 300 400 500 600 700 800 D1 MR1 D2 - MR2 ...::: MRT DT - MC