I. Variety of purposes of the price-fixing agencies, 138. — Methods of price fixing, 140. — II. Cost method of price fixing, 142. — Accountant's cost of production, 144. — Use of the accountant's cost in price fixing, 145. — Profit as the margin above cost, 150. — III. Development of the theory of profit, 151. — Explanation of and justification for profit, 155. — Relation of the theory of profit to price fixing, 159. — IV. Conclusions, 160.