The concept of marginal or marginal (marginal) are the neoclassical school of Economics into the early 20th century. It is the change in a given quantity. Marginal costs of primary education is the change in total costs for a student must spend in order to further study a unit of knowledge. Marginal benefits is the change in total benefits to learners have to learn yet another unit of that knowledge. The purpose of the marginal analysis on cost-benefit in education is to identify the optimal choice (stops) when investments in human capital. On Figure 2, if the learner stopped at point C, then the marginal cost MC (in direct costs) in point C is not equal to marginal benefits to MR (including economic benefits and its utility) in point A should this option not yet optimal. According to the principle of Economics, choice of optimal only when MR by MC at point b. O'Donoghue (1999) States that those with higher incomes have a higher personal marginal benefits. The reason is that humans carry the economic engine will continue to increase productivity, increase revenue, and increasing marginal benefit from attendance (see Becker, 1964; Mincer, 1974; Strober, 1990). This is an important assumption when to approach human capital investment model. But in reality, many people skip school again soon while others continue to invest in education. So, has the school soon to be stupid and continue to attend school as smart?Human capital investment modelFigure 3 shows A and B is the point where each individual's optimal choice for investing in human capital. At this point, marginal benefit equals marginal cost. Depending on the calculation of cost-benefit, there is a stop at point A is level with E1 and go to work but there are also people who stop at point B with qualified as E2 if they find that at point B, they become competitive in the labour market. Human nature is an infinite desire and self-interest, should in principle, individuals want to achieve optimal performance (Mincer, 1974). However, if we assume the individual attended school because of economic reasons, there are two binding elements should the individual choose the different stops which leads to their education level is different. The binding that is the innate ability of the learner (Spence, 1973; Weiss, 1995; Ashenfelter and Rouse, 1998; Arcidiaconno, Bayer, and Hizmo, 2010) and discount rates or variable interest loans (in terms of the market for financial education works perfectly) (see Woodhall, 2004; Checchi, 2005). This difference leads to two people who attended school with education level and thus their compensation wages on the labour market is also different.
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