a\" (-I . warn I'D me right Illustrates the market for outdoor concert tickets in a park in the middle of _ am area in a particular town. Ticket prices are measured in dollars (the grid is drawn for j $.50 Increments) and ticket quantities are measured in thousands. The locals are not happy ' \"the increased trafc congestion and noise that accompany each concert. Note that supply curve 81 represents the marginal private cost of the concerts. What is the cost of the externality .' Iv per concert ticket? -(:) per concert ticket sold. , The cost of the externality is