Theory

Second-Derivative Test Showing Profit-Maximizing Output is Inefficiently High

The second derivative of the social utility function can be used to demonstrate that a plantation's profit-maximizing output (QpQ_p) is excessively high when negative externalities exist. At the output level QpQ_p, where the first derivative of the utility function is negative, the second derivative is also negative, under the condition that the marginal external cost (MEC) increases with output. Since both the function's slope and its rate of change are negative, it mathematically confirms that output must be reduced from QpQ_p to satisfy the first-order condition for a Pareto-efficient allocation.

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Updated 2025-07-23

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