The diagram to the right illustrates the market for outdoor concert tickets in a park in the middle of a residential area in a particular town. Ticket prices are measured in dollars (the grid is drawn for $2.50 increments) and ticket quantities are measured in thousands. The locals are not happy about the increased trafc congestion and noise that accompany each concert. Which supply curve represents the marginal private cost of the concerts? What is the market equilibrium? Supply curve El represents the marginal private cost (MPC) of the concerts. Because marginal private costs the costs of the El externality, marginal private costs are ' than marginal social costs. The market equilibrium price is $E| and quantity is D ticket(s). $50 $45 $40 $35 $30 $25 $20 $15 $10 $5 $0 5 10 15 20 25 Q of Tickets (Thousands) 30 35