Previously, the researchers separated the educational elements out of the capacity factors, personality, motivation, family background, etc Of their research shows that education has a very strong correlation with respect to the income of the employee (Morgan, David, Cohen, and the Brazer, 1962; Becker, 1964; Psacharoupoulos, 1975). However, the question whether or not the differences in income due to the education factor is still a controversial issue. A person's income can depend on not only education but also the innate ability, the school conditions, and other factors not yet known (as in the method of least squares estimation). This can be seen in people who have high academic qualifications but low income and low education level but high income. Again it was heated up when a recent study of Wealth-X and UBS (Swiss Bank) shows that 35% of the world's billionaires with no college degree (Findlaw, 2014). From here, we see that the assumption on (going to school because of economic reasons) are important when studying economics education based on the human capital investment.Marginal analysis of cost-benefitThough in any stage of life or any form of training would, analyze the cost-benefits are always needed. It not only reflects the nature of human self-interest but also talking up the budget that society give to education is limited. Meanwhile, education was viewed as a form of investment in human capital should each unit of money spent for education must be calculated in relation to the benefit, first and foremost is revenue. This task is known as cost-benefit analysis (cost-benefit analysis). This is one of the criteria for the decision to go to the most onerous in educational planning. According to Woodhall (2004), the concept of cost-benefit analysis is the systematic comparison of the costs and benefits of a form of investment in order to assess its economic profits. In the economics of education, analysis of yield (rate of returns) in school is a form of marginal analysis is the most important use of this concept.
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