• Define the term "positive externality."Explain the impact of this positive externality on the market P and Q.
• Graphically, what is the Socially Optimal amount of Q? (Use Q_SOC to indicate this quantity).Explain how you arrived at this output and compare this output to both perfectly competitive market output Q₀ and the cartel output Q_C.
• Graphically indicate the size of deadweight loss (if there is any DWL),