Below is a graph that shows the demand and marginal revenue curve of a monopolist with four potential operating points (A, B, C, D) and their corresponding prices (Pa, Pg, Pc, Pp) and quantities (Qa, Qs Qc. Qp)- Demand Qo Q a. Does this graph represent a market with a negative or positive externality? a. Equilibrium quantity produced by the market [ Choose | 60 30 Socially efficient quantity [ Choose ] 60 30 b. What is the value of the deadweight loss that this externality creates? o Depending on if this is a positive or negative externality, the government should either tax or subsidize this good to eliminate the deadweight loss. What is the optimal size of that per-unit tax or subsidy? (enter a numerical value) d. You can use the graph to determine that equation that describes the marginal external cost or benefit, depending on what the graph represents. What is the equation that describes it? What equation would best describe the externality?Choose below a. 10+0.25Q b. 10+40.5Q . 10+0.75Q d.10+Q e. 0.25Q f.0.5Q g 0.75Q h