Use the following graphs to answer the next question.The graphs show the long-run average total cost (LRATC) curve for cars. For which graph is the output level Q0 at minimum efficient scale?

If the consumption function is C = 90 + 0.75y, then the marginal propensity to consume is

A) 0.2.5. B) 0.75. C) 67.5. D) 90.

As the interest rate rises, the present value of a given perpetual stream of income

A) increases. B) decreases. C) does not change. D) approaches infinity.