Originally published in 1979, the purpose of this book is to introduce a theory of the distribution of national income between wages, profits and other categories of income. The relation between this branch of distribution theory and other areas of economics is explained in the Introduction. The first six chapters are designed to introduce distribution theory to students of intermediate economic principles. The reader should be familiar with the basic analysis of supply, demand and market equilibrium, and with the use of indifference curves to represent a consumer's preferences. The remaining seven chapters discuss developments of the theory introduced in the first six.