VOLUME 1 Introduction D. Collard Principles and Methods of Industrial Peace, 1905, 260pp Economic Science in Relation to Practice, 1908, 32pp VOLUME 2 Wealth and Welfare, 1912, 524pp VOLUME 3 Economics of Welfare [1920] 1932 4th ed., 868pp VOLUME 4 Unemployment, 1914, 258pp The Political Economy of War, [1921] 2nd ed., 1940, 176pp VOLUME 5 Essays in Applied Economics, 1923, 205pp VOLUME 6 Industrial Fluctuations, [1927] 2nd ed., 1929, 447pp VOLUME 7 A Study in Public Finance, [1928] 3rd ed., 1947, 303pp VOLUME 8 The Theory of Unemployment, 1933, 344pp VOLUME 9 The Economics of Stationary States, 1935, 337pp VOLUME 10 Employment and Equilibrium, [1941] 2nd ed., 1949, 293pp VOLUME 11 Income: An Introduction to Economics, 1946, 125pp Income Revisited, 1955, 94pp VOLUME 12 Aspects of British Economic History 1918-1925, 1947, 259pp VOLUME 13 Keynes General Theory, 1950, 77pp Alfred Marshall and Current Thought, 1953, 92pp VOLUME 14 Essays in Economics, 1952, 247pp

I. General characteristics of the potash industry, 31.— II. The industry's demand curve: relationship between potash prices and mixed fertilizer prices, 32; elasticity of the demand for fertilizer, 34; elasticity of the demand for potash, 42. — III. Nature of the supply: few sellers, 43; formally free entry, 43; no exit from the industry without loss, 47. — IV. History of potash prices in the United States: base prices (prices at the ports), 48; the basing point system of pricing, 53. — V. The individual demand curve, 55. — VI. The effects of oligopoly: profits and expanding capacity, 60. — VII. Conclusions, 67.