11.2.3 Third-degree price discrimination Third-degree price discrimination-Practice of dividing consumers into two or more groups with separate demand curves and charging different prices to each group. ▣元=PQ1+P2Q2-C(Q) First,we set incremental profit for sales to the first group of consumers equal to zero △π/△Q1=△(P1Q)/△Q1-△C/AQ1=0 MR=MC11.2.3 Third-degree price discrimination  Third-degree price discrimination - Practice of dividing consumers into two or more groups with separate demand curves and charging different prices to each group.   = P1Q1 + P2Q2 - C(QT) First, we set incremental profit for sales to the first group of consumers equal to zero /Q1 = (P1Q1 )/Q1 - C/Q1 = 0 MR1 = MC