If s denotes savings rate, I denotes aggregate investment, and Y denotes GDP, then which of the following equations is correct?

Marginal utility theory predicts that a rise in the price of a banana results in

A) the demand curve for bananas shifting rightward. B) the demand curve for bananas shifting leftward. C) a movement upward along the demand curve for bananas. D) a movement downward along the demand curve for bananas.

It is assumed that the marginal benefit of air cleanliness falls with the degree of cleanliness since

A) the marginal cost of air cleanliness increases. B) air cleanliness is a public good and not a private good. C) the marginal utility of air cleanliness falls with the degree of cleanliness. D) the generation of pollution should be considered an externality.