This opportunity cost classroom activity gives introductory economics and business students 30 minutes to choose how a small company should use a limited budget. Students compare three plans, identify the best alternative they give up, and revise their decision when a forecast changes. The lesson runs on paper with a calculator.
Download the free opportunity cost worksheet (PDF) and the separate instructor answer key (PDF). Both use the same fictional business example in US dollars. No ClassTycoon account is needed.
Opportunity cost is the value of the best available alternative you give up when making a choice. If a company uses its budget for equipment, it cannot use that same money for another plan. The relevant comparison is with its best feasible alternative, rather than the sum of every rejected idea.
Spend the first five minutes introducing a campus printing business with $1,000 available for one month. It can fund a marketing campaign, rent equipment, pay for staff training, or keep the money. Each spending plan requires the full $1,000 upfront. The business cannot borrow, split a plan, combine plans, or repeat a plan during the month.
The owner wants the largest expected increase in cash by month-end. Each plan’s forecast receipts are additional customer payments after all other extra operating payments, but before deducting the $1,000 upfront payment. Existing business activity is the same under every option and is excluded. All payments settle within the month. Assume no tax, interest, unpaid bills, resale value, or benefits after the month. Keeping the money earns no return.
The marketing campaign forecasts $1,450 in receipts on this basis. Equipment rental forecasts $1,600. Staff training forecasts $1,350. These are teaching assumptions, not typical returns for real businesses. Excluding later benefits makes this a one-month comparison rather than a full investment appraisal.
Give pairs eight minutes to calculate each plan’s expected net cash gain. Subtract the $1,000 upfront payment once. Marketing produces a $450 gain, equipment rental produces $600, and training produces $350. Keeping the money produces no gain and preserves the original $1,000.
Ask each pair to rank the four choices and commit to one. Under the stated objective and forecasts, equipment rental ranks first, followed by marketing, training, and keeping the money. Expected month-end cash from the exercise is $1,600 with equipment, $1,450 with marketing, $1,350 with training, or $1,000 if the owner does nothing.
Use the next seven minutes to compare the chosen plan with the best rejected plan. If the company rents equipment, its best alternative is marketing. The opportunity cost of committing the budget to equipment is the $450 expected net gain it gives up from marketing. This measures the forgone return on the budget. The $1,000 cash payment has already been included in each net-gain calculation.
The equipment plan’s expected advantage over marketing is $150, calculated as $600 minus $450. That advantage is different from the $450 opportunity cost. It is also different from the $1,000 paid for equipment rental. Ask students to explain what each of these three numbers measures.
If a pair chooses marketing instead, the best alternative becomes equipment rental. Marketing’s opportunity cost is therefore the $600 expected net gain from equipment. Marketing delivers $150 less expected gain than that alternative. A student choosing training would also give up the $600 equipment gain.
Do not add the marketing and training gains together when evaluating equipment. The company cannot afford both plans. Do not deduct the $1,000 payment a second time from a net gain. Students should name one feasible alternative and use the same time period and measure of value for every comparison.
Spend five minutes on a separate revised case. Before any money is committed, new information raises the marketing forecast receipts to $1,800. Equipment and training forecasts remain unchanged. Reset the decision using the original $1,000 budget. This is a fresh comparison, not a second month or a chance to recover money already spent.
Marketing now has an expected net gain of $800 and becomes the preferred plan. Its best alternative is equipment, so choosing marketing has an opportunity cost of $600. Marketing’s expected advantage is $200. If the company still chooses equipment, it now gives up the $800 expected marketing gain.
Swipe sideways to see the full table. With a keyboard, focus the table area and use the arrow keys.
| Plan | Original case | Revised case |
|---|---|---|
| Marketing | $450 | $800 |
| Equipment rental | $600 | $600 |
| Staff training | $350 | $350 |
| Keep the money | $0 | $0 |
With equipment chosen originally, the best rejected plan is marketing and its $450 gain is the opportunity cost. With marketing chosen in the revised case, the best rejected plan is equipment and its $600 gain is the opportunity cost. The respective advantages are $150 and $200.
Both cases use the same fictional one-month assumptions and $1,000 starting budget. The revised case replaces the original forecast before any money is spent.
Use the final five minutes for an individual explanation. Ask students to name their revised choice, its expected net gain, its best alternative, and the value forgone. Then ask what they would need to know if the forecasts were uncertain or staff training also helped next year.
The calculation gives one preferred choice under the exercise’s assumptions. Real decisions may also depend on payment timing, forecast reliability, and benefits beyond the comparison period. Students who propose another choice should explain which assumption they are changing and what evidence would justify it.
For the debrief, check whether students can distinguish the upfront payment, opportunity cost, and advantage over the next-best plan. Assess their comparison and explanation as well as the arithmetic. For another teaching approach to the concept, see Wharton’s lesson on alternative choices and opportunity costs.
Use the break-even analysis classroom activity when students need more practice separating revenue and costs. Continue with the cash flow vs profit classroom activity to explore why an attractive forecast may still leave a business unable to pay a bill on time.
For a later class, explore the ClassTycoon simulations. Ask each Team Company to record its chosen decision and best rejected alternative before a Round, then discuss its reasoning after the results. Use the selected scenario’s actual choices and reports. The fixed returns and one-plan budget in this paper lesson are teaching assumptions, not claims about ClassTycoon’s game rules.
Print one worksheet per pair and keep the answer key for the debrief. Have students commit to their first choice before sharing the revised marketing forecast.