When firms price their products by adding a percentage markup to their average costs of production, this is called

When industrial activity increases,

A) GDP decreases because of pollution. B) pollution does not necessarily increase. C) health and life expectancy decrease. D) and real GDP increases, it is the case that in all nations fewer resources are devoted to protecting the environment. E) the increase in real GDP is partially offset by the increase in pollution.

The fact that our wants are unlimited but our resources are limited implies that

A) we should limit our wants. B) entrepreneurship has failed as an economic system. C) we have to make choices. D) the only way to make someone better off is to make someone else worse off.