Necessity of differentiating demand with respect to the time element, 131. — Meaning of long and short run, 132. — Spending without free current choice, 132. — Saving, 133. — Habitually consumed goods, 134. — "Petty" goods, 134. — Social demand curve for such goods, 135. — Stocking up, 135. — Significance of the demand schedule in such cases, 136. — Experimental spending, 137. — Residual saving, 138. — Demand in the long run, 138. — The markets for the great staples, 141. — Conclusion, 142.

I. Lack of focus in discussion of policy, 73. — Limiting assumptions necessary to achieve focus, 75. — II. Political assumptions stated, indicating probable continuance of general policy, 75. — III. Relative laxity of past enforcement, 78. — Changes of emphasis in discussions of policy, 81. — Continuing importance of problems emphasized in earlier discussions, 82. — IV. Possible changes in substantive law to provide more effective enforcement, 84. — V. Present deficiencies in administration, 89. — Possible improvement of administration, 90. — VI. Methods of making exceptions to anti-trust policy, 93. — Limits upon use of consent decrees, 97. — Legislative approach to exemption of particular industries, 98. — VII. Anti-trust law policy not "archaic, " 100. — Does not imply government of narrow powers, 101. — Greater effectiveness possible, 101.

Introduction: two approaches to the problem, 522. — I. Rigidity as a relative concept, 522; as a characteristic of the total system of prices, 524; as an indication of the degree of monopoly, 525. — Measurement of the degree of monopoly, 526. — II. The method employed: average prime costs vs. marginal costs, 527. — The statistical technique, 529. — Analysis of the data, 530.