One of the controversies surrounding the United States' energy markets is the trade-off between energy production and clean air.Assuming clean air has value,the United States will be on its production possibility frontier if and only if:

Question

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The production possibility frontier (PPF) represents the maximum combination of goods or services that can be produced with full and efficient use of resources. In this context, being on the PPF means that the resources used to produce clean air and energy are being fully and efficiently utilized, indicating an optimal trade-off between the two. Choices A, B, and C do not necessarily imply efficient resource use or an optimal trade-off.

One of the Controversies Surrounding the United States' Energy Markets