Opportunity cost is the benefit of the next most valued alternative you give up when you make a choice. Resources such as money, time and space are limited, so choosing one use means another use cannot happen.
Cambridge-style questions ask for it when a business owner must choose between options, so it sits at the start of enterprise and business purpose.
How do you find the opportunity cost?
Follow four steps, using the same order every time.
- List the real options the owner could choose with the same resource.
- Estimate the benefit of each option, in money or another clear measure.
- Pick the owner’s choice and mark it.
- Name the most valuable of the remaining options. That one, and only that one, is the opportunity cost.
The benefit given up should be measured in the same units as the choice, such as ringgit per month.
Worked example
Zainal has RM40,000 in savings and three options.
| Option | Expected benefit |
|---|---|
| A. Nasi kandar kiosk in Ipoh | Profit of RM3,000 a month |
| B. Phone repair shop | Profit of RM2,600 a month |
| C. Fixed deposit at 3% a year | Interest of RM1,200 a year |
Step 1, put them on the same scale. C gives RM40,000 × 3% = RM1,200 a year, which is RM1,200 ÷ 12 = RM100 a month.
Step 2, rank them. A is RM3,000 a month, B is RM2,600 and C is RM100.
Step 3, mark the choice. Zainal chooses A, the kiosk.
Step 4, name the opportunity cost. The next most valued alternative is B, so the opportunity cost is RM2,600 a month from the phone repair shop.
A good written answer connects it to the decision: “Zainal gives up RM2,600 a month from the repair shop, but the kiosk’s expected RM3,000 is higher, so the choice looks reasonable on profit alone.”
The mistake to watch for
Mistaken answer: “The opportunity cost is RM2,600 + RM100 = RM2,700 a month.”
This adds every option Zainal rejected.
Zainal could not run the phone shop and also use the same RM40,000 for the deposit, so he is not giving up both.
The opportunity cost is only the single most valuable alternative, which is RM2,600 a month. Another slip is to quote the RM40,000 itself. That is the amount invested, not the benefit forgone.
Check yourself
1. A factory owner uses a shop unit as a store. It could be rented out for RM2,000 a month. What is the monthly opportunity cost of using it as a store?
Show answer
The next most valued use is renting it out, so the opportunity cost is RM2,000 a month. The owner pays no rent to anyone, but the benefit of renting is given up.
2. Aisha spends Saturday doing deliveries herself. Her alternatives were tutoring for RM120, or resting, which she values at RM60. What is the opportunity cost of her Saturday?
Show answer
The next most valued alternative is the higher one, tutoring, so the opportunity cost is RM120. The RM60 rest is a lower alternative and is not added.
3. A bakery has one oven slot. Cakes would give RM240 profit, bread RM180 and cookies RM150. It chooses cakes. State the opportunity cost.
Show answer
The most valuable alternative given up is bread at RM180. The opportunity cost is RM180. The cookies at RM150 are the third choice and are not part of the answer.
Where this leads next
Opportunity cost explains why an idea is chosen. The next lesson, classify an activity by economic sector, shows where that idea sits in the wider economy. If you want to see how money tied up in a start-up differs from profit, try the cash versus profit bridge.
A common weakness is a correct definition followed by an unclear example. Teachers in online one-to-one Business tuition can mark your short case answers line by line and show where a sentence stops linking to the facts.