Opportunity Cost: The Return You Give Up, and How to Price It

Opportunity cost is the return from the best alternative given up by choosing what was chosen. The foregone return is money that would otherwise have been in hand, and losing it is a real cost. Nothing was paid for that loss, and it appears on no statement. Pricing opportunity cost means naming the next best alternative and its return, and the figure can turn a decision that looks profitable into one that is not.

Every rupee can be in exactly one place at a time. The one-place-at-a-time rule is the whole idea. If Rs 22,00,00,000 is sitting inside a plywood business, it is not sitting in a deposit, not repaying a loan and not buying the plot next door, and each of those roads had a return of its own. So choosing a road costs more than what was paid to travel it. Choosing also costs the best of the returns walked away from, and nobody sends a bill for that. Opportunity cost has a named alternative behind it, a rupee figure, a place in a project's arithmetic, a sharp line between itself and money already spent, and a precise answer to what it costs Sohan Malhotra to keep a stake he could sell tomorrow.

What is opportunity cost, and why is it a real cost?

A case small enough to feel comes first. A friend asks to borrow Rs 1,00,000 for a year, interest free, and returns exactly Rs 1,00,000 twelve months later. Not a rupee is missing. Did the loan cost anything? Counting what happened to the money says no. Counting what could have happened to it says yes: the same Rs 1,00,000 in a fixed depositMoney placed with a bank for an agreed period at an agreed rate of interest, returned with that interest at the end. The money cannot be withdrawn freely without giving up some of the interest. at an illustrative 7 per cent a year would have handed the lender Rs 1,07,000. The lender ends the year Rs 7,000 behind the version who took the other road. Nothing left the pocket, and the lender is still poorer.

Opportunity cost is the return from the best road not taken, and it is a real cost because it changes how much money is left at the end. The test of whether a cost is real is not whether cash moved. The test is whether the chooser is worse off than they would otherwise have been. The worse-off test catches the Rs 7,000 in the example above, and no accounting entry ever will. The cost also exists only because the alternative was genuinely available. If no bank would have taken the Rs 1,00,000, there was no road to walk away from and no cost to count.

Now scale it up without changing anything else. Sohan Ply and Boards Private Limited, an invented maker of plywood and laminates that runs one plant, has attracted an offer. Deodar Growth Partners, an invented private equity investor, has offered Rs 22,00,00,000 for 20 per cent of the business. Rs 22,00,00,000 is one fifth of the business, and the offer therefore puts the whole of it at Rs 1,10,00,00,000. Sohan Malhotra, who has built the business and holds it outright, can take the Rs 22,00,00,000 or keep the fifth. The moment the offer exists, Rs 22,00,00,000 of real, collectable money becomes the road not taken, and keeping the stake stops being free. The offer did not change the business by one plank of plywood. The offer changed what keeping the business costs.

Why does opportunity cost never appear on any statement?

Open Sohan Ply's numbers for the year and read down them. Revenue of Rs 1,80,00,00,000. Operating profit before depreciation of Rs 21,00,00,000. Depreciation and amortisation of Rs 4,00,00,000. Interest of Rs 4,50,00,000. Sohan Ply is left with profit before taxWhat is left of revenue after every operating cost and interest has been paid, but before income tax. Often shortened to PBT. of Rs 12,50,00,000, and the subtraction ties exactly: 21 less 4 less 4.5 leaves 12.5, in crore. Every one of those costs has something in common. Each was paid to somebody. The suppliers were paid for timber and glue, the staff for their months, the bank its interest, and depreciation is the plant being paid back for wearing out. Behind each line sits a bill, a voucher and a counterparty.

A statement is a record of transactions, and opportunity cost is not a transaction. No bookkeeping system on earth will produce a line for it. There is no invoice for the deposit interest Sohan Malhotra did not collect, because there is no bank he did not deal with who is going to send him one. Accountants have a name for the costs that do appear: explicit costsCosts where money actually moved to somebody outside: wages, rent, interest, the price of raw material. Each explicit cost can be traced to a document., the ones with paperwork. The costs that do not appear are implicit costsCosts where nothing was paid but something was given up: the rent forgone by using an owned building, the salary forgone by working in one's own business., and opportunity cost is the largest of them.

Here is the everyday version, and it is worth sitting with. Two shops sell the same goods on the same street. One shopkeeper pays Rs 30,000 a month in rent. The other has bought her shop outright and pays no rent, so her books show Rs 30,000 more profit every month, and she believes she is the better trader. She is not necessarily. She is giving up the Rs 30,000 a month she could collect by letting the shop to somebody else and trading from a rented one. The foregone rent is as real as the rent her neighbour pays. The foregone rent has no paperwork and never reaches her profit line, and she compares herself with the wrong number for years.

How is opportunity cost priced, and which alternative counts?

If the cost is invisible, it has to be built by hand, and the build has three steps. Name the alternatives that were genuinely open for that money. Work out what each would have returned over the same stretch of time. Take the single best one. The third step is where most people go wrong. The opportunity cost is the return of the best alternative alone, never the sum of the alternatives, and only one of them could have been taken anyway. Adding them up describes a world in which the same rupees are in three places at once, which is the one thing money cannot do.

Run it on the Rs 22,00,00,000. Left in a current account it earns nothing. In a savings account at an illustrative 3 per cent it earns Rs 66,00,000 a year. In a plain fixed deposit at an illustrative 7 per cent it earns Rs 1,54,00,000 a year. The three are not additive. The deposit simply beats the other two, and the deposit is therefore the next best alternativeThe one option that would have been taken if the chosen option had not existed. Not any option, and not all of them together, but the best single one that was genuinely available. and Rs 1,54,00,000 a year is the price of the road not taken.

Two conditions have to hold before an alternative is allowed onto the list, and both are easy to fudge. The first is that it must have been genuinely available. No bank offers it, or the money is locked away for three years. A return of that kind is a daydream, not an alternative, and putting it on the list makes every decision look bad. The second is that it must be roughly comparable in risk. Suppose somebody offers Sohan Malhotra an illustrative 12 per cent on Rs 22,00,00,000 in a venture that might return nothing at all. A venture promise and a bank promise are not the same kind of promise. The 12 per cent is no yardstick for a safe alternative. Comparing a business return with a deposit return is already a stretch. The honest conclusion about Sohan Malhotra's stake is a question about risk rather than a verdict.

How can opportunity cost turn a profitable decision into a losing one?

Now watch the idea do some damage. Ritu Chandran, the finance head at Sohan Ply, is handed a proposal for a new stacking shed. The shed costs Rs 5,00,00,000 to build and will save handling and spoilage worth Rs 30,00,000 every year. The proposal is honest, the savings are real, and the shed will show up in next year's numbers as Rs 30,00,000 of extra profit. On the statement it is a success. The shed really is a success on the statement, and the success is the trap.

The division comes before the approval. Rs 30,00,000 on Rs 5,00,00,000 is a return of 6 per cent a year. The same Rs 5,00,00,000 in the deposit already named would have returned an illustrative 7 per cent, or Rs 35,00,000 a year, doing nothing at all. So the shed hands the business Rs 30,00,000 and quietly costs it the Rs 35,00,000 it gave up. Once the foregone Rs 35,00,000 is subtracted, a project reported as Rs 30,00,000 of profit is really Rs 5,00,000 a year of loss, and the accounts will never say so. Both numbers are correct at the same time. The books measure what the shed earned; the decision has to measure what the shed earned compared with the best thing the money could have done instead.

The general rule falls straight out of the arithmetic. A use of money adds value only when its return beats the return of the next best alternative, and nothing else about it matters to that comparison. A project can be profitable, popular, sensible and still be a mistake. The money simply had somewhere better to be. The same arithmetic is why comparing a project's return against zero teaches nothing. Zero is not one of the options once a deposit exists.

How is opportunity cost different from a sunk cost?

Two years ago Sohan Ply spent Rs 1,20,00,000 on a drying kiln that never ran at full capacity. The money is gone. No decision taken today can bring back one rupee of it, whether the kiln is scrapped, kept, repaired or ignored. Money spent like that is a sunk costMoney already spent that cannot be recovered whatever is chosen next. No choice can change a sunk cost, and a sunk cost should not influence the choice., and the rule about it is short. The number is the same under every option on the table, and it does not belong in today's decision.

Opportunity cost looks forward at what the next rupee could earn elsewhere. A sunk cost looks backward at money that no longer responds to any choice. One belongs in the decision and the other never does. Confusing them is expensive in both directions. Somebody who counts the sunk Rs 1,20,00,000 keeps pouring money into the kiln to justify what was already spent. Somebody who ignores opportunity cost approves a shed that loses Rs 5,00,000 a year. The first mistake is emotional and famous. The second mistake is arithmetical and quiet, and it costs more. The quiet one repeats on every proposal that crosses the desk.

Here is the sharp edge where the two meet, and it catches careful people. Suppose that failed kiln can be sold for scrap today at Rs 15,00,000, or kept in the corner as a spare. The Rs 1,20,00,000 is irrelevant to that choice. The Rs 15,00,000 is still on the table. Keeping the kiln means giving up Rs 15,00,000 that could be in hand tomorrow, and that makes Rs 15,00,000 the opportunity cost of keeping it. The same object carries a sunk cost that must be ignored and an opportunity cost that must be counted, and telling them apart is a matter of asking one question. Can this number still change depending on what is chosen? If yes, it counts. If no, it is history.

What does keeping the 20 per cent stake cost Sohan Malhotra?

Everything above now runs on one decision. Deodar Growth Partners has offered Rs 22,00,00,000 for a minority stakeA holding of less than half a business, earning a share of the profits but not by itself deciding how the business is run. of 20 per cent. Sohan Malhotra can accept, or keep the fifth and carry on. Price both roads in rupees a year and the choice becomes a comparison rather than a feeling.

Start with what keeping earns. Sohan Ply's profit before tax this year is Rs 12,50,00,000, but that figure includes a Rs 2,20,00,000 insurance recovery for a fire in the previous year and a Rs 90,00,000 one-time relocation cost, neither of which will repeat. Strip both out and the normalised figure is Rs 11,20,00,000, the number a buyer would work from. A fifth of Rs 11,20,00,000 is Rs 2,24,00,000 a year, and that is what the retained stake earns before tax. Rs 2,24,00,000 divided by Rs 22,00,00,000 is 0.1018, a return of about 10.2 per cent a year on the Rs 22,00,00,000 on offer.

Now price the road not taken. Sell, take the Rs 22,00,00,000 and place it in the plain fixed deposit at an illustrative 7 per cent, and it returns Rs 1,54,00,000 a year without a single order book, dealer or monsoon to worry about. The opportunity cost of keeping the stake is therefore Rs 1,54,00,000 a year, and keeping it is ahead by Rs 70,00,000 a year, the entire payment Sohan Malhotra receives for carrying the risks of a plywood business rather than the risks of a deposit. That is the honest way to state the position, and it is a question rather than an answer: is Rs 70,00,000 a year enough compensation for a business that depends on timber prices, dealer credit and one plant? Different people answer that differently, and neither Rs 2,24,00,000 nor Rs 1,54,00,000 appears anywhere in Sohan Ply's accounts.

How do a lender, an investor and a household use opportunity cost in practice?

Practitioners rarely say the words. Practitioners build the idea into a number and then argue about the number, and the idea is worth recognising in its working clothes. Deodar Growth Partners tells the people whose money it invests that it will not put rupees into a business unless those rupees can earn 18 per cent a year, an illustrative figure stated for this case. The 18 per cent is a hurdle rateThe minimum yearly return an investor requires before committing money to something. Anything below the hurdle is refused. The money is assumed to have somewhere better to go., and a hurdle rate is opportunity cost with a job title: it is what Deodar believes its money can earn in the next best deal already on its desk, at a similar risk. Every proposal that returns less is refused, however profitable it looks on its own.

The bank behind Sohan Ply's term loan runs the same test from the other side. The bank has a fixed pool of money to lend, and lending Rs 40,00,00,000 to a plywood plant means not lending the same Rs 40,00,00,000 to somebody else, so the rate it asks reflects what those other borrowers would have paid at similar risk. The same pool is why a lender can turn down a perfectly sound borrower. The borrower is not being judged in isolation. The borrower is being judged against whoever else is standing in the queue.

An analyst reading Sohan Ply does the same arithmetic on the working capital. Receivables of Rs 30,00,00,000 and inventory of Rs 27,00,00,000 against payables of Rs 21,00,00,000 leave Rs 36,00,00,000 tied up in the cycle. Asking what that Rs 36,00,00,000 could earn elsewhere converts a dry balance sheet number into a cost the business pays every year for the way it collects and stocks. Practitioners argue hard about a single percentage point in a hurdle rate for one reason. The percentage point is the entire content of the opportunity cost, and everything downstream is arithmetic. And the household version is the same test in miniature: Rs 3,00,000 left in a current account while a deposit would pay an illustrative 7 per cent is giving up Rs 21,000 a year, which nobody notices because nothing was ever paid.

Sohan Ply and Boards Private Limited, Sohan Malhotra, Ritu Chandran and Deodar Growth Partners are invented.
Educational material. Not advice on any investment, tax, budget or market position.