Concept of opportunity cost is one of the main microeconomics theory in describing relationship between scarcity and choice (Buchanan,2008). Opportunity cost is generally defined as the highest-value option forgone, which is the cost of an alternative that have to be forgone in order to pursue a certain action. This term is firstly devised by Austrian economist Friedrich von Wieser in 1914 that regard the cost of giving up alternative choice when an option has been decided. Opportunity cost is about making choices between several mutually exclusive alternatives under a scarcity situation (Magnus & Milton C., 1993). From an economic point of view, since resources are scarce relative to needs, the use of resources in one way prevents their use in other ways (Sloman, 2013). In others words, whenever a decision has been made, it has to be given up the benefit of alternative choices. This mean the benefits of the highest-valued option forsaken could have received by taking an alternative action is counted as the opportunity cost.
Taking crop choice of a farmer as an example, it is given that size of a farmland is fixed, which its amount of output is limited. If the farmer decides to grow wheat, his opportunity cost will be the alternative crop that might have been grown like rice, potatoes and corns instead. Another example will be the