Opportunity cost
Every yes costs the best thing you gave up, so name it before you spend.
- money
- autopilot
- hermes
Divya gets a ₹20,000 bonus at her office in Pune. The phone she has used for four years has gone slow, and a new one costs exactly that. She checks her balance, sees she can afford it, and plans to buy it on Saturday.
Nobody asks the second question: what else could that ₹20,000 do?
That question is opportunity cost. It is the value of the best option you give up when you choose something. The price tag shows what you pay. The opportunity cost shows what you give up to pay it. The term is often credited to the Austrian economist Friedrich von Wieser.
The decision, worked through
Divya has not paid yet. Before she does, she writes one line: "If not the phone, then..." and names the two best uses of the same money.
The first is part of her education loan, which would shorten the loan a little. The second is a certification course she has been eyeing for her next role. She also thinks of a train ticket home to Nagpur for her cousin's wedding, but two alternatives are enough, so she keeps the first two.
Now the phone is no longer compared with nothing. It is compared with something she can name. The phone may still win. Her old one is slow, and she uses it all day. The difference is that when it wins, she knows what it beat, and she is paying with her eyes open. She may even split the money. Whichever way she goes, the decision stays hers.
Where it goes wrong
Opportunity cost can be stretched too far. A rupee has a hundred possible uses, and listing every one of them is just a slow way of not deciding. Compare with the best one or two real alternatives, not every imaginable one.
It is also not only about money. An evening has an opportunity cost. So does a weekend course, and so does saying yes to a favour. Doing nothing is a choice too, and it gives something up as well.
One thing to try today
Pick one purchase or one yes you are weighing this week. Before you pay or reply, write "If not this, then..." and name your two best alternatives, with the rupee amount or the hours next to each. Then decide. The first time will feel slow and a bit fussy.
This is a way to think, not financial, medical or legal advice.
Each Sunday: one mental model and one real decision to try it on. Browse the model library.
What it is
Every choice has a price you do not see on the bill.
- The price tag
- What you pay: the rupees, the hours, the effort.
- The opportunity cost
- The value of the best option you gave up in order to pay that price.
If not this, then what?
When to reach for it
When you hear yourself say 'I can afford it.'
- Spending a bonus or savings
- A phone upgrade, a bike, a big purchase for the house.
- Spending time
- A weekend course, an extra project, a yes to a favour. An evening can only be spent once.
- Choosing between two good things
- Each one is the price of the other.
An everyday example
A ₹20,000 bonus and a slow phone.
- The first thought
- The balance says yes. It does not say what else the money could do.
- The better question
- Name the two best uses: part of a loan, a course for the next role, a trip home. Write the amount next to each.
- What changes
- The phone may still win. Now it wins against something you can name, and you are paying with your eyes open.
I can afford it, so I will buy it.
If not the phone, then...
The trap
Weighing a choice is not the same as stalling on it.
- Listing every alternative
- A rupee has a hundred possible uses. Compare with the best one or two real ones.
- Counting only rupees
- Time, energy and a free evening have an opportunity cost too. Doing nothing gives something up as well.
Try this today
One purchase or one yes, and a pen.
- Name the alternatives
- Write your two best alternatives with the rupees or hours next to each. Then decide.
If not this, then...