"Human Capital" is Becker's study of how investment in an individual's education and training is similar to business investments in equipment. Becker looks at the effects of investment in education on earnings and employment, and shows how his theory measures the incentive for such investment, as well as the costs and returns from college and high school education. Another part of the study explores the relation between age and earnings. This edition includes four new chapters, covering recent ideas about human capital, fertility and economic growth, the division of labour, economic considerations within the family, and inequality in earnings.