In the above table, the efficient level of output can be achieved through a per unit subsidy of $ Just enter a value. Do not include the "$" sign. For example, 123,456 or 98,202. Quantity (units) 1,000 2,000 3,000 4,000 5,000 6,000 Marginal private benefit (dollars per unit) 45 40 35 30 25 20 Marginal private cost marginal social cost (dollars per unit) Marginal social benefit (dollars per | unit) 90 80 70 60 50 40 30 40 50 60 70 80