Marginal thinking — Economics, 14–17
Marginal thinking asks what one extra unit costs and brings. It helps you compare the next step, rather than treating every choice as all-or-nothing.
The next unit
Marginal thinking looks at the change caused by one more unit: one more hour, slice, worker or kilometre. You compare the extra benefit with the extra cost, not the total benefit with the total cost. The question is: is the next step worth it?
Why compare the next step?
A total can hide a bad final decision. A cinema ticket may already be paid, but buying an expensive snack is a new choice with a new cost and benefit. Economists use marginal thinking because many real decisions happen one step at a time.
One more hour of study
You have studied for two hours and expect 8 more exam points from one extra hour. That hour costs you a €6 shift, so its opportunity cost is €6. If the extra points are worth more to you than €6, study; if not, take the shift. The comparison concerns this hour only.
The sunk-cost trap
A common mistake is to continue because you have already spent money or time. That feels sensible: stopping can feel like admitting the earlier choice was wrong. But a past cost cannot be recovered, so it should not decide the next step. Compare only future extra costs and benefits.
Small decisions, everywhere
You use marginal thinking when deciding whether to revise for another 20 minutes, add data to a phone plan or take one more shift. A restaurant uses it to decide whether opening one extra evening will bring enough sales to cover its extra staff and energy costs.
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