The economy is in macroequilibrium at the national income level where the aggregate expenditure curve intersects the 45-degree line

Suppose we are considering the relationship between two variables y and x. y is measured on the y-axis and x is measured on the x-axis, and the relationship between then is a straight line. Suppose that the slope of the line is equal to 1

This slope means that A) a change in x is associated with a bigger change in y. B) a change in x is associated with a smaller change in y. C) a change in x is associated with no change in y. D) a change in x is associated with an equal change in y.

Economic efficiency is achieved when there is a market outcome in which the marginal benefit to consumers of the last unit produced is equal to its marginal cost of production and

A) the difference between consumer surplus and producer surplus is maximized. B) economic surplus is minimized. C) consumer surplus plus producer surplus is maximized. D) economic surplus plus consumer surplus equals producer surplus.