This document discusses human capital formation, which is the process of improving the knowledge, skills, abilities, and health of people. It involves investing in education, health, on-the-job training, migration, and acquiring information to make people more productive. Sources of human capital formation include expenditures on education, health, migration, and training. While physical capital is tangible and separable from owners, human capital is intangible and inseparable from people as it consists of their skills and knowledge.