The following shows the demands andmarginal 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.

As with the PPT slides, you can view the data generating these lines; for reference,

D1 = 310 - 0.2Q

D2 = 450 - 0.2Q

MRT = 380 - 0.2Q

DT = 380 - 0.1Q

MC = 0.0005Q^2 - 0.55Q + 290