Empirical studies indicate that the maximum amount of air pollution occurs ________ levels of real GDP per person.

Question

Quizplus · Accepted Answer

Middle-income countries, like Mexico, are between the rich industrialized countries and the abject poor countries. Middle-income countries tend to have pollution problems because they are developed enough for industry but not rich enough to afford clean air and waterways.

Empirical Studies Indicate That the Maximum Amount of Air Pollution