-The tables above show the marginal costs and benefits from the production of paper. If the market is perfectly competitive and unregulated, at the equilibrium level of output, the marginal external cost is

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In a perfectly competitive and unregulated market, the equilibrium level of output is determined where marginal private cost equals marginal benefit. The marginal external cost is the difference between the marginal social cost and the marginal private cost at this equilibrium. Without the specific tables, we can't calculate the exact figures, but if the marginal external cost is given as an option, it implies there is additional information provided in the tables that would allow for its calculation. Assuming option A is correct, it suggests that at the equilibrium level of output, the marginal social cost is $20 higher than the marginal private cost, representing the marginal external cost.

-The Tables Above Show the Marginal Costs and Benefits from the Production