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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Cost-benefit analysis (CBA) compares the expected costs and benefits of a decision against a defined baseline. It can show whether an option’s monetized benefits outweigh its monetized costs, but it does not by itself resolve questions about fairness, unpriced effects, or who gains and who pays.
What is cost-benefit analysis?
Cost-benefit analysis is a structured way to assess whether a choice is worthwhile by identifying its consequences, valuing them where possible, and comparing them over a defined period. The UK government’s Magenta Book describes it as comparing relevant costs and benefits of policy decisions to assess value for money for society. Effects are measured against a counterfactual: what would likely happen without the option.
CBA can include financial, environmental, and social consequences. An organization assessing a business investment might focus on its own cash flows, while a social or public analysis also considers effects on other people and organizations. The Office of Management and Budget (OMB), in its archived 1992 Circular A-94, defines benefit-cost analysis as “a systematic quantitative method of assessing the desirability of government projects or policies when it is important to take a long view of future effects and a broad view of possible side-effects.” That circular is useful for explaining the method; it should not be treated as current, universal guidance on discount rates.
Choose whose costs and benefits count
Perspective changes what belongs in the analysis. A private analysis may count the decision-maker’s expenses and returns. A social analysis may also count external effects not captured in market prices, such as costs imposed on others. OMB notes that private and social costs can diverge because of externalities, market power, taxes, and subsidies.
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How to do a cost-benefit analysis
A useful CBA makes its assumptions visible and compares feasible options on a consistent basis. HM Treasury’s Green Book describes appraisal as assessing the costs, benefits, and risks of options for achieving objectives.
- Define the decision and objective. State the problem, the choice to be made, and the outcomes the decision is intended to achieve.
- Set the baseline and alternatives. Specify a credible counterfactual, such as continuing current practice or taking no action, then list feasible alternatives. Compare each option with that same baseline; changing the baseline can change the apparent result.
- Set perspective, scope, and time horizon. Say whether the analysis is private, organizational, or social; identify affected groups; and establish when costs and benefits are expected to occur.
- Identify and estimate consequences. Include relevant direct and indirect effects, intended and unintended outcomes, and opportunity costs—the value of resources in their next-best use. State assumptions explicitly.
- Assign monetary values where defensible. Document how estimates were made. Keep material effects that cannot reasonably be priced in a separate qualitative account rather than omitting them.
- Discount future effects. Convert future costs and benefits into present values using a rate suited to the applicable jurisdiction and analysis. The appropriate rate depends on context and governing guidance; do not assume a rate from archived federal guidance applies universally.
- Compare the options. Calculate net present value (NPV), and consider the benefit-cost ratio (BCR) alongside scale, timing, distribution, uncertainty, and non-monetized effects.
- Test uncertainty and report limitations. Vary important assumptions, identify unpriced effects, and explain who bears costs and receives benefits. A CBA informs a decision; it does not settle value judgments or distributional choices by itself.
How to calculate and interpret CBA results
Net present value
Net present value is the present value of benefits minus the present value of costs:
NPV = present value of benefits − present value of costs
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A positive NPV means the monetized benefits exceed the monetized costs under the analysis’s stated assumptions and scope. It does not prove that every affected person benefits or that the option is automatically the best choice. The U.S. Government Accountability Office explains NPV as discounted benefits less discounted costs and notes that options with positive NPV are generally preferred.
Benefit-cost ratio
The benefit-cost ratio is the present value of benefits divided by the present value of costs:
BCR = present value of benefits ÷ present value of costs
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A BCR above 1 indicates that estimated discounted benefits exceed estimated discounted costs, provided the scope and valuation are consistent. A ratio alone can mislead when options differ in scale: ranking by BCR may differ from ranking by net benefits. Report NPV and relevant context as well.
Simple hypothetical example
Suppose an option has present-value benefits of $120,000 and present-value costs of $100,000. These are invented teaching figures, not empirical estimates.
- NPV: $120,000 − $100,000 = $20,000.
- BCR: $120,000 ÷ $100,000 = 1.2.
On these assumptions, monetized benefits exceed monetized costs. A decision-maker should also consider excluded effects, uncertainty, who pays and who benefits, and the discount rate used.
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How to compare multiple options
Do not reduce a complex choice to one number. Compare options using a consistent scope and consider:
- NPV and scale: estimated net benefits and the size of the costs and benefits behind them.
- Timing and duration: when costs arise, when benefits arrive, and how long each lasts.
- Uncertainty: how results change when consequential assumptions vary.
- Distribution: which groups pay, benefit, or bear risks.
- Unpriced effects: important outcomes retained qualitatively because a monetary value is not defensible.
- Feasibility and risk: whether the option can be delivered and what could prevent its expected effects.
These factors can point in different directions. Explain the trade-offs instead of implying that a single ranking captures every relevant consideration.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Cost-benefit analysis vs. cost-effectiveness analysis
CBA aims to express both costs and benefits in monetary terms, making it possible to compare options with different types or levels of benefits. Cost-effectiveness analysis (CEA) compares the cost of achieving a specified outcome. It can be more suitable when options deliver the same benefit, or when outcomes can be measured consistently but cannot reasonably be assigned dollar values.
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OMB describes CEA as a less comprehensive method that may be appropriate when benefits are the same or a decision has already established the required benefit level. If the outcomes differ substantially, CEA alone may not show whether the benefits justify the costs; CBA is designed to address that broader question when benefits can be valued credibly.
What a CBA can—and cannot—tell you
A well-scoped CBA makes assumptions and trade-offs clearer, but its result depends on the baseline, perspective, time horizon, valuation choices, and discount rate. Some effects may remain qualitative, and aggregate positive net benefits do not show how gains and losses are distributed. Treat the figures as decision evidence, not as a substitute for judgment about fairness, feasibility, or values that the analysis cannot capture.
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