Use the following to answer questions: Figure: Dishwashing Detergent -(Figure: Dishwashing Detergent) Refer to the figure. Dishwashing detergent contains phosphates that harm marine life. According to this figure, which statement is TRUE? A) The maximum willingness to pay for the 6^th unit equals the private cost. B) The social cost of the 9^th unit is $9 while the value to consumers is $9, eliminating the gains from trade. C) The maximum willingness to pay for the 12^th unit equals $18, or the private cost plus the social cost. D) The social cost of the 9^th unit is $15 while the value to consumers is $9, creating a deadweight loss equal to $6.

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According to the figure, the social cost of the 9^th unit is $15 while the value to consumers is $9. This creates a deadweight loss of $6, which is the difference between the social cost and the private value. Therefore, the correct statement is D.

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