This model (Figure 3) shows the increasing marginal costs up while marginal benefits is increasingly reduced. Marginal benefits depend on labor market conditions, the resources invested in education, and the ability of the learner, while marginal costs depend on the direct costs of attendance, innate ability (can) and the family background of the learners (see Ashenfelter and Rouse , 1998; Checchi, 2005). Marginal benefits is increasingly reduced to mean human capital and the utility obtained is increasingly less. Meanwhile, marginal costs rise also means financial pressures for the growing school. The inverse turn between these two factors makes this model so important and meaningful for the individual as well as the systems and educational institution.For the study, based on this model, we predict their behavior not only in training but also in training after the official rules (in Office). In other words, with marginal analysis method about the cost-benefit in order to determine the optimal point where investment in human capital, we can explain why employees often go to school when young and why training activities was shrinking as older workers. Not only that, this model is also reflected in the educational policy of the State and international organizations such as the World Bank, UNESCO, or UNDP. They care about elementary education more than high school, junior high school more, and of course, more secondary college. Therefore, we see compulsory education, free education or compulsory education always start from primary, news from the bottom up, and have never direction.4. DiscussionThe increasing complexity of human society has made the science cannot stand alone dominates the specialized knowledge as before. This can be seen in the social sciences-these places appeared more interdisciplinary, including economics, education, to solve the problems that each individual major does not do. Due to an interdisciplinary, economics education promote strengths of some specific but also so that the researchers approach it in different ways, making this industry become very complicated. To resolve this issue, the author has based on the Foundation of Economics to the reasoning and limitation of malformed study of economics education. Through articles, we see the education production function and the amount of it is human capital. Since this is also a factor early on, it became a scarce resource and requires us to analyze the optimum timing based on marginal costs and marginal benefits of attendance to bring out the most rational investment decisions. This model approach not only helps us evaluate the decisions on education one way and also help us to understand and evaluate the policy trends of the education systems in the world scientifically. Here, the article may end up by answering the question the author poses in the introduction. If we assume the individual attended school because of economic reasons and this interdisciplinary research to calculate the economic efficiency of education then this model approach is most reasonable. This also means that the educational economics does not only revolve around the economic benefits because indeed education is also nghiều other effects to the socio-economic and technological changes, generate positive effects foreign exchange, enhancing the harmony in society, etc., But to assess the impact from higher education interdisciplinary, has a hinged cover on the contents?
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