Opportunity cost & trade-offs

What it is

A factory that spends this week making chairs cannot also make tables. The profit it could have made on tables is the real cost of the chairs. Economists call this opportunity cost: the value of the best thing you give up when you spend a scarce resource.

A trade-off is what you agree to lose for your choice. You might give up speed to lower risk, customers to earn more on each one, or profit now for a stronger position next year. Write down both sides: what you gain and what you give up. Compare your proposal with the best other use of the resource, not with doing nothing.

Where it comes from

The idea has no single author. The Austrian economist Friedrich von Wieser (1851–1926) built the idea, which is known in English as alternative cost. Using a resource, he said, costs the value of its best other use. He set it out in an 1884 study and developed it in Der natürliche Werth (1889). That book came out in English as Natural Value in 1893.

In January 1894 the economist David I. Green gave the idea its English name, opportunity cost, in the Quarterly Journal of Economics.

But the idea is older than Wieser. In 1850 the French economist Frédéric Bastiat wrote the pamphlet Ce qu'on voit et ce qu'on ne voit pas. A weak analyst, he argued, counts only the visible effect of a decision. A good one also counts what the same money would have done elsewhere.

"Trade-off" is everyday business English that no scholar coined. Managers use the two ideas together out of habit, not because of any theory.

What it corrects

A proposal reaches the board, and its numbers beat the lowest return the company accepts. But the team has compared the project only with doing nothing. Good teams do it too, because accounts work that way: money out, money in, time to pay back.

The accounts have no line for the second-best use of the same factory, the same twelve engineers or six months of top managers' attention. Careful teams check the project's numbers more closely, but they never add the missing line. So a company can approve twenty proposals that each make money and still spend its scarcest resource on its third-best use. Nobody asked what else that resource could be used for.

How it works

1. Name the scarce resource the decision uses up: money, factory capacity, engineers' time, top managers' attention, customers' trust or the freedom to change course later.
2. Say what the resource is for, and over what period you will judge the result.
3. Name the strongest realistic other use of the same resource. Keeping it in reserve counts too, if you really can.
4. Score both uses against the same goal over the same period.
5. Write the trade-off in one sentence: what you give up to get the advantage you chose.
6. Say what would make you swap the ranking, and where you would see it.

Worked example

Intel began by making memory chips. In 1970 it put the first DRAM memory chip on sale. By the early 1980s Japanese makers were winning that market on price and volume.

Intel was short of factory capacity, not cash. Each week its plants could start only so many wafers, the silicon discs that chips are made on. Intel's planners shared out that capacity by one fixed rule: earn the most profit from each wafer. So they weighed each DRAM wafer against what it would earn as microprocessors. Wafer by wafer, microprocessors won. DRAM output shrank, though no meeting decided that it should.

Robert Burgelman, a Stanford professor, later studied the episode. He found that under this rule production had moved to microprocessors before the official strategy changed. On 10 October 1985 Intel announced it was leaving DRAM. The exit was costly: in 1986 Intel cut 7,200 jobs and closed eight older plants. Yet it spent $228 million on research and development, 18% of that year's revenue.

Andy Grove, then Intel's president, later called leaving DRAM "the best business decision we ever made". Intel's own timeline quotes him. The planners' rule gave that answer years before the official strategy changed. It weighed each wafer against its best other use, not against an idle plant.

In a Business Case Weekly case

In the Arm case, you decide in 2025 how much of the finished chip Arm should design itself. Its licensees pay to use its architecture, the basic design of their chips. If Arm sells complete compute subsystems, ready-made blocks of a chip, it earns more per design and helps customers move faster. But it also comes closer to its licensees' products.

With opportunity cost in mind, you rank the options instead of only counting revenue. Engineers who build subsystems are not improving the architecture that licensees pay for. Staying neutral, out of its licensees' markets, is a resource too, and Arm can spend it only once. Say which advantage is worth that cost, and which customer reaction would make you swap the ranking. Where to stop is still your call.

In your answer

• "The scarce resource here is ___. Its strongest other use is ___."
• "I give up ___ to get ___. The exchange is worth it because ___."
• "Keeping this capacity in reserve has a cost too: ___."
• "I would swap this ranking if ___. I would see it in ___."

Common misuse

The usual mistake is to list every drawback of your choice and call it opportunity cost. A list of risks is not an option you gave up. To tell them apart, ask: can you name a specific other use of the same resource, and would you fund it instead? If you cannot, there is no opportunity cost on the page, only worries.

The second mistake is false precision: a confident number for an option you never tried. If you cannot honestly estimate what you gave up, rank the options. Then say what evidence would change the ranking.

References

• Friedrich von Wieser, Natural Value, translated by Christian A. Malloch and edited by William Smart (Macmillan, 1893) — the idea in English: archive.org/details/naturalvalue00wiesiala
• David I. Green, "Pain-Cost and Opportunity-Cost", Quarterly Journal of Economics 8(2), 1894, pp. 218–229 — the paper that named it: econpapers.repec.org record
• Robert A. Burgelman, "Fading Memories: A Process Theory of Strategic Business Exit in Dynamic Environments", Administrative Science Quarterly 39(1), 1994, pp. 24–56 — the Intel study behind the example: gsb.stanford.edu record
• CORE Econ, The Economy, Unit 3: scarcity, work and choice — the idea explained through examples: books.core-econ.org/the-economy/v1/book/text/03.html