The maximum benefit that could have been obtained from an alternative choice that was forgone by making a particular decision. An invisible cost, but an essential concept for rational decision-making.
Uncovering the "True Cost" with Opportunity Cost
Opportunity cost reveals the "true cost" that isn't visible from the amount paid alone. For example, if you spend 30 minutes each way traveling to a distant store for a sale, you incur a one-hour time cost for the round trip. If you could earn 1,500 yen per hour, the opportunity cost of that hour is 1,500 yen. Even if the sale saves you 300 yen, including the opportunity cost results in a net loss of 1,200 yen.
Opportunity cost also factors into food delivery decisions. Cooking at home for 500 yen in ingredients versus ordering through Uber Eats for 1,500 yen seems wasteful at first glance. However, if cooking takes an hour, you should compare it with the value of spending that hour on work or study. If the opportunity cost of your time exceeds 1,000 yen, delivery becomes the more rational choice.
Applying Opportunity Cost to Everyday Saving Decisions
The opportunity cost of point-earning activities is also often overlooked. If it takes 5 minutes to earn 1 point (worth 1 yen) by answering a survey, that's an hourly rate of 12 yen. Those 5 minutes might be more productively spent on other activities. Point-earning activities appear to be "getting something for free," but you're paying the opportunity cost of time.
The same applies to coupon hunting. Spending 10 minutes finding a 200-yen-off coupon online is work worth 1,200 yen per hour - that's worthwhile. But spending 30 minutes finding a 100-yen-off coupon is work worth 200 yen per hour, and that time would be better spent on something else. Having the perspective of opportunity cost clarifies the priority of your saving activities.
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