Use the above figure. Which graph depicts complementary goods?

In U.S. recessions, growth in total consumption is ________, which is ________ with the workings of the permanent-income and life-cycle hypotheses

A) largely uninterrupted, perfectly consistent B) largely uninterrupted, rather inconsistent C) noticeably reduced, perfectly consistent D) noticeably reduced, rather inconsistent

Where marginal cost is less than average cost,

a. opportunity cost must have been excluded from the calculation of marginal cost. b. marginal cost must be falling. c. marginal cost must be rising. d. marginal cost may be rising, falling, or constant.