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Cambridge Definition
the value of the action that you do not choose, when choosing between two possible options
Cambridge Link
OPPORTUNITY COST – Cambridge English Dictionary
Wikipedia Definition
In microeconomic theory, the opportunity cost of a choice is the value of the best alternative forgone where, given limited resources, a choice needs to be made between several mutually exclusive alternatives. Assuming the best choice is made, it is the "cost" incurred by not enjoying the benefit that would have been had if the second best available choice had been taken instead.[1]