Price (5) Social Cost 10 - - - - Supply (Private Cost) 8 8 - 1 - - - - - 1 6 - - - - - 4 - - - 1 Demand 20 30 Quantity 18. In the diagram, the dollar value of the deadweight loss caused by the externality is: (1) $5 (2) $10 (3) $15 (4) $20 19. In the diagram, the corrective tax that would cause the firm to internalize the externality is: (1) $4 per unit of output. (2) $3 per unit of output (3) $2 per unit of output. (4) $1 per unit of output