751
1 point: Vertical axis labeled “Price, marginal social benefit” or “Dollars per unit,” horizontal axis labeled “Quantity of antivirus software” or “Q”
1 point: Upward-
1 point: Downward-
1 point: The market quantity of antivirus software is found at the intersection of supply and demand and shown on the horizontal axis.
1 point: Downward-
1 point: The optimal quantity of antivirus software is found at the intersection of supply and marginal social benefit and shown on the horizontal axis.
1 point: The correct deadweight-
1 point: A Pigouvian subsidy equal to the marginal external benefit at the socially optimal quantity
1 point: A government regulation requiring the optimal quantity of antivirus software