Rhetorical Appeals

Cost-​Benefit

Decide whether one option is worth it by weighing what it costs against what it gains.

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What & why

What it is
A logical framework that sets what one option costs (money, time, effort, risk, what is given up, and who carries each) against what it gains, then gives a verdict: yes, no, yes under a named condition, or yes to a cheaper version. Where figures exist it compares upfront and ongoing costs with returns over time, often as a payback period. Known costs and savings can be stated plainly; untested benefits are presented as estimates. Making the weighing explicit lets listeners check the reasoning rather than take the verdict on trust.
Why it works

Cost-benefit framing makes choices feel rational and tractable. Laying out clear costs alongside clear benefits can reduce the effort of weighing a complex decision, giving listeners a defensible, structured framework that tends to make the trade-offs easier to evaluate and act on.

Before & after

These are fictional teaching examples, not accounts of real events.

Before

“This will be worth the investment.”

After

“The booking system costs $5,000 to set up and $1,000 a year. Staff now spend about 400 hours a year on manual bookings, roughly $8,000 of their time. Even if it saves only half of that, it pays for itself in under two years, so I recommend buying it.”

See it in action

An original teaching example. The situations and results are fictional.

Should our club buy its own projector?

Benefits

Owning a projector would end the trips we make to borrow one: we borrow twice a month, and each loan means collecting it the day before and returning it the day after. We could also set up whenever we liked.

Costs

It would cost about £350 once, and someone would need to store it and look after the cables.

Conclusion

Against nearly fifty trips a year, a one-off £350 and a cupboard shelf are a small price, so I would buy it and ask the member who lives nearest the hall to store it.

How the answer works

Benefits
Explain what the option gains, stated plainly when known.
Costs
Name the money, time, effort, risk or other things given up, and who carries them.
Conclusion
Weigh the two sides and give a verdict.

Why it works: Benefits come first, and they are known because the loans already happen. The conclusion weighs the trips against the price and the storage job, gives a clear yes and names who carries the cost.

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When you’ll use it

Deciding whether a software purchase is worth its setup and running costs

Weighing a new hire’s salary against the work it frees up

Judging whether an office move’s costs are repaid by lower rent

Deciding whether a course, car or subscription is worth it for you

Pro tip

Name every cost, including time and who carries it, weigh rather than count, then give a clear verdict.

Questions & answers

What is cost-benefit analysis in business presentations?

Cost-benefit analysis sets the costs of a proposed action against its expected benefits, weighs them, and says plainly whether the action is worth it.

How do I present cost-benefit analysis effectively?

Include all relevant costs and benefits, use consistent timeframes, quantify when possible, acknowledge uncertainties, consider both direct and indirect effects, and present information clearly with appropriate visual aids.

What factors should I include in business cost-benefit analysis?

Include direct costs, indirect costs, opportunity costs, implementation costs, training costs, expected benefits, risk factors, timeline considerations, and both quantifiable and qualitative factors that impact business success.

Does a cost-benefit answer have to say yes?

No. A clear no is as useful as a yes. A conditional answer works when it names the condition, such as “yes, if a volunteer will store it”.

What if the benefit has not been proven?

Say what is known and what is estimated. A price or a count you already have can be stated plainly; a forecast, such as more customers, should be presented as likely, not certain.

Learn more

Stanford Encyclopedia of Philosophy - Aristotle's Rhetoric
Purdue OWL - Using Rhetorical Strategies for Persuasion
Wikipedia - Cost-benefit analysis

Put it into practice

Practice Cost-Benefit

Work through examples, then test your understanding in a short quiz. Your progress is saved as you practice.

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