Briefly describe the embodiment of human capital investment.

A: First, tangible expenditure, also known as direct expenditure and actual expenditure, mainly includes education expenditure, medical and health care expenditure, domestic labor mobility (migration) expenditure or immigration expenditure (for finding a job) and collecting labor price information, among which the most important investment form is education expenditure.

Second, intangible expenditure, also known as opportunity cost, refers to the income given up during the investment period because it is impossible to work, at least not to engage in full-time work.

Third, psychological loss, also known as mental cost and psychological cost, refers to hard and boring study, boring and tiring job search, and staying away from friends.