Opportunity cost (also referred to as Alternative cost) is defined by New Oxford American Dictionary as "the loss of potential gain from other alternatives when one alternative is chosen". [1]

As a representation of the relationship between scarcity and choice, [2] the objective of opportunity cost is to ensure efficient use of scarce resources. [3] It incorporates all associated costs of a decision, both explicit and implicit. [4] Opportunity cost also includes the utility or economic benefit an individual lost, it is indeed more than the monetary payment or actions taken. As an example, to go for a walk may not have any financial costs imbedded to it. Yet, the opportunity forgone is the time spent walking which could have been used instead for other purposes such as earning an income. [3]