14) "Diminishing marginal returns" refer * 1 point to a situation in which the A) marginal cost of the next worker hired is O less than the marginal cost of the previous worker hired. B) average cost of the next worker hired is O less than the average cost of the previous worker hired. C) marginal product of the next worker hired O is less than the marginal product of the previous worker hired. D) average product of the next worker hired O is less than the average product of the previous worker hired. 15) Which of the following would be # 1 point classified as a fixed cost for the local supermarket? O A) The cost of the boxes of cereal sold in the store. O B) The salary and any overtime paid the store's manager. O C) The rent from the six-year lease for the building the store uses O D) The Social Security tax the store pays the federal government on the workers' income