Preface; Foreword; Part I. Introduction: 1. Definition; 2. Method; 3. Interpretation; Part II. The London Building Industry, 1845-1913: 1. Introduction; 2. Brickwork; 3. Carpentry and joinery; 4. Masonry; 5. Roofing; 6. Plumbing; 7. Painting; 8. Plastering; 9. The building industry - costs; 10. The building industry - size; 11. Provisional conclusions concerning the building industry; Part III. The Lancashire Cotton Industry, 1845-1913: 1. Introduction; 2. Index numbers of prices; 3. The size of the industry; 4. Provisional conclusions; Part IV. The Cleveland Pig Iron Industry, 1883-1925: 1. Introduction; 2. Index numbers, etc.; 3. The size of the industry, materials used, and size of the firms engaged therein; 4. Provisional conclusions; Part V. The Massachusetts Cotton Industry, 1845-1920: 1. Introduction; 2. The index numbers of prices and costs; 3. The size of the industry and of the firms engaged therein; 4. Provisional conclusions; Part VI. The American Pig Iron Industry, 1883-1925: 1. Introduction; 2. The index numbers of prices and costs; 3. The size of the industry and of the operating units; 4. Provisional conclusions; Part VII. Conclusion: 1. Summary of results; 2. Historical aspects; 3. Elasticities of return; 4. Causation; Statistical appendices: Appendix 1. The London building industry, 1845-1913; Appendix 2. The Lancashire cotton industry, 1845-1913; Appendix 3. The Cleveland pig iron industry, 1883-1925; Appendix 4. The Massachusetts cotton industry, 1845-1920; Appendix 5. The American pig iron industry, 1883-1925; Index.