Answer :
Workers earn more money when the demand for labor in an industry increases, when they have more human capital, and when they perform more dangerous jobs.
Human capital is a term used by social scientists to describe personal characteristics that are thought to be useful in the production process. It includes employee knowledge, skills, and know-how, as well as good health and education. Individual earnings are significantly influenced by human capital.
Human Capital Formation Sources. Education investment, along with other sources such as health, migration, on-the-job training, and information, is recognized as one of the primary sources of human capital.
Hence, the correct answer is "D".
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