From the perspective of macro-marketing, the discrepancy between the small quantity of a product that individual consumers need and the large quantity that firms produce exists because:
a) businesses can satisfy customers better when they have large inventory surpluses.
b) it is necessary to achieve customer satisfaction.
c) society has evolved past a subsistence economy.
d) firms seek to benefit from economies of scale.
e) businesses prefer to store products for long periods.
Answer D