Opportunity costs Definition
The opportunity cost definition can be simplified as follows: Opportunity costs represent the foregone benefit of an alternative course of action not chosen.
Confusing? Wikipedia shows a slightly longer Opportunity costs Definition: Opportunity costs are "... not real Costs according to Cost accountingbut put lost profits or lost Benefit which was used in the Decision for one of several alternatives in comparison to the best alternative is completely absent or only reduced".
More confused? Let's look at a couple of opportunity cost examples. Example 1 is about whether you should exercise after a long day at work in front of your laptop, or whether you should still work overtime? (In parentheses you will find the opportunity cost of the decision).