P. E. Hart 
Studies in Profit, Business Saving and Investment in the United Kingdom 1920-1962 [PDF ebook] 
Volume 2

Originally published in 1968, this second volume of the Glasgow Studies in Profit, Business Saving and Investment uses the financial data assembled in Volume 1 to test economic theories of the factor distribution income, of the appropriation of profit, of the determinants of investment, and of the return on capital. The tests enabled the measurement of long-run and short-run variation of the ratio of profit to employee compensation in the United Kingdom at the level of individual industries and the whole industrial sector. As well as measuring the relationship between a company’s sales or profits and its expenditure on fixed assets, the book describes the long-term decline in the rate of return on capital in the UK and measures the effect of the intensity of competition on this return.