ECX5001 Chap.2 Cost-Benefit Analysis and Environmental Valuation
Cost-Benefit Analysis and Environmental Valuation
Cost-benefit analysis compares incremental social benefits and costs against a credible without-policy baseline. The workflow defines standing, predicts causal effects, values market and non-market changes, discounts dated streams and stress-tests assumptions. Environmental valuation can use revealed behaviour in related markets or stated choices for changes that behaviour cannot reveal.
The assessment challenge is to show what drives the result without hiding distribution, physical outcomes or uncertainty inside a single net number.
What this chapter covers
- 01
The without-policy baseline
- 02
Incremental social effects
- 03
Standing and distribution
- 04
Present value and discounting
- 05
Revealed preference valuation
- 06
Stated preference and benefit transfer
Worked example · free
Calculate and stress-test project value
- +1Discount year-one benefits: 70,000 divided by 1.05 equals $66,666.67.
- +1Discount year-two benefits: 72,000 divided by 1.05 squared equals $65,306.12.
- +1Add present benefits to obtain $131,972.79.
- +1Subtract present costs: net present value equals $11,972.79.
- +1Explain that the sign depends on the baseline, effects, valuation, rate and omitted distribution.
Key terms
- Standing
- The rule defining whose gains and losses count in an appraisal.
- Present value
- A future flow converted into today's terms using a declared discount rate and date.
- Hedonic pricing
- A revealed-preference method that relates market prices to environmental attributes while controlling for other features.
- Choice experiment
- A stated-preference method that asks respondents to choose among alternatives with varied attributes and costs.
- Incremental effect
- The difference between the outcome with an intervention and the credible outcome without it, rather than the observed total.
- Sensitivity analysis
- A structured test of how the decision changes when important uncertain assumptions or inputs are varied.
- Non-use value
- Value attached to an environmental change even when the person does not directly consume or visit the resource.
Cost-Benefit Analysis and Environmental Valuation FAQ
Why is the baseline so important?
Benefits and costs are changes relative to what would otherwise happen. If technology, traffic or environmental quality would improve without the project, treating today's condition as fixed credits the intervention for unrelated progress and can reverse the ranking.
How should non-market environmental benefits be valued?
Choose a method that matches the service. Related market behaviour can support hedonic or travel-cost estimates, while well-designed stated choices can address non-use or future changes. Keep physical outcomes visible and test whether transferred values fit the new population and context.
Does a positive net present value settle the decision?
It supports the project under the selected standing and assumptions, but the decision also needs distribution, omitted effects, uncertainty and implementation. Show the switching values and consider redesign or compensation when aggregate gains coexist with concentrated losses.
How should transfers be handled in an appraisal?
A payment can be a loss to one party and a receipt to another, so it is not automatically a net social resource cost within the same standing. Administration, compliance effort and behavioural distortion can still be real costs and should be counted separately.
Why does the discount rate matter for environmental policy?
Many environmental benefits arrive well after current costs. A higher discount rate reduces the present value of distant effects more strongly, which can change a ranking. Print the chosen rate and show scenarios rather than allowing the assumption to remain hidden.
When is benefit transfer credible?
It is more credible when the original and policy settings have comparable populations, baseline conditions, environmental changes, substitutes and units. Adjust prices consistently, disclose the original method and test a range that reflects transfer uncertainty.
What is the difference between financial and social cost?
Financial cost records payments by an organisation, while social cost tracks real resources and welfare effects across the chosen standing. A tax is a financial outflow for the payer but also revenue for government; administration, lost time and behavioural distortion can still be genuine social costs that need separate entries.
How should uncertainty be presented in a recommendation?
Identify the assumptions most capable of changing the ranking, vary them over defensible ranges, and report the switching value or scenario. Keep uncertainty about causal effects, prices, lifetime and discounting separate. Conclude with the decision implied by each case and the evidence worth collecting before commitment.
Why should physical impacts appear before monetary values?
Listing tonnes, illnesses, habitat changes or travel time first makes the causal chain auditable and prevents a valuation coefficient from hiding an unsupported impact estimate. It also lets readers substitute another defensible value without rebuilding the appraisal. State the unit, affected population, timing and baseline before multiplying quantity by value.
Assessment move
Use the appraisal ladder in the same order every time: baseline, incremental effects, valuation, timing, sensitivity and distribution. Recompute small present-value examples by hand and label each dated flow. When reviewing a study, ask whether the environmental change, population and available substitutes match the policy setting. Finish with the threshold at which the recommendation changes.
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