You win a free ticket to an Eric Clapton concert. You can’t sell it. Bob Dylan is playing the same night, and his tickets cost $40. You’d happily pay up to $50 to see Dylan.
What does it cost you to see Clapton?
In 2005, economists Paul Ferraro and Laura Taylor put this exact question to about 200 professional economists. The answer is $10: by choosing Clapton, you give up a Dylan night that was worth $50 to you and would have cost $40.
Only about one in five got it right. Most thought the free ticket cost nothing.
Nothing is free
That missing $10 is opportunity cost: the value of the best option you gave up when you chose.
It’s easy to miss because it never shows up on a bill. The ticket says ₹0. The price tag is invisible. It lives in the evening you didn’t have.
Every choice has one, because time, money and attention can only be spent once. Saying yes to one thing is always, quietly, saying no to something else.
Think of a thali
A thali has a fixed number of katoris. Fill one with a third helping of rice and there’s no room left for the dal you actually wanted.
The rice didn’t cost extra. It cost you the dal.
Where you’ll spot it
- An MBA. The fees are the visible cost. The bigger one is often two years of salary you won’t earn while you study.
- Your evening. An hour of scrolling is also an hour not spent reading, sleeping or calling a friend.
- Money in a savings account. Safe, yes. But it also costs you whatever the same money could have earned somewhere else.
- A company’s best engineers. Put them on feature A, and feature B waits. Every roadmap is a list of opportunity costs.
Not the same as sunk cost
The two are easy to mix up, but they point in opposite directions.
A sunk cost is behind you: money already spent, which shouldn’t affect what you do next. An opportunity cost is ahead of you: the value you’ll give up, which absolutely should.
Good decisions ignore the first and count the second.
How to use it
When something looks like a good deal, ask: compared to what?
Don’t compare an option with doing nothing. Compare it with your next-best alternative, and name that alternative out loud. “Is this course worth ₹40,000?” becomes “Is this course worth more than ₹40,000 and the three months of weekends I’d spend on it?”
Sometimes the answer is still yes. But now you’re paying the real price, not the one on the ticket.
Nothing is free. Some things are just paid for with the road you didn’t take.
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