Price discrimination: marginal revenue equalized across two customer panels Customer A Customer B Price ($) Quantity Quantity 0 0 D_A MR_A D_B MR_B MC = AC $4 $4 MR* = $4 5 $8 3 $6 MR* = $4. Customer A: 5 units at $8. Customer B: 3 units at $6. Marginal revenue is equal ($4) across both buyers and equal to marginal cost -- the less price-sensitive buyer (A) pays the higher price, $8 vs $6.