Three types of maladjustment between supply and demand to be analyzed with respect to their influence on elasticity of demand, 652. — I. The industry: effect of maladjustment of the first type, 654; of the second type, 654; of the third type, non-durable goods, 654; durable goods, 656. — II. Buyer attitudes, 659. — Consumer purchases, 660. — Dealer purchases, 661.—Processor purchases, 662. — III. The firm's marginal revenue curve: non-differentiated goods, 663; differentiated goods, 664.