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Panel (b) Panel (c) Supply Supply P2 Social value Demand Demand Q2 03 Q4 05 Refer to Figure 10-9, Panel (b). The market equilibrium quantity is O a. Q2, which is the socially optimal quantity. Ob. Q2, and the socially optimal quantity is Q3. O c. Q3, which is the socially optimal quantity, O d. Q3, and the socially optimal quantity is Q2