Contingent Valuation
What is Contingent Valuation?
Contingent valuation is a survey method that values a nonmarket good by asking people what they would pay for it in a described hypothetical situation.
Clean air, an unspoiled river and a surviving species carry no price tag, so analysts either infer values from related behavior (revealed preference, such as travel costs or house prices) or ask people directly (stated preference). Contingent valuation is the main stated preference tool, and the value is contingent on the hypothetical market the survey describes: a specific improvement, a specific way of paying for it, and usually a yes or no vote on a stated dollar amount, which mimics a real referendum. It is the only family of methods that can pick up non-use values such as existence value, since those leave no trace in behavior. The cost is credibility, because no money actually changes hands and answers can drift above what people would really pay.
Contingent Valuation: a worked example
A regulator studies restoring a wetland. A random sample of 1,000 households in the affected region is asked whether it would vote yes to a yearly charge for the restoration, with different households facing different amounts, and the pattern of yes answers implies a mean willingness to pay of $25 per household per year. With 400,000 households in the region, the annual benefit is 400,000 × $25 = $10 million against an annual cost of $6 million, so the project passes. Before trusting that result the analyst runs a scope test: if households offer the same $25 for restoring a wetland twice as large, the number is not measuring what it claims to.
The mistake students make with contingent valuation
The tempting error is treating a survey figure as if it were an observed market price. It is a statement about a hypothetical payment, and stated amounts usually run above what people hand over when the payment becomes real, a pattern called hypothetical bias. Answers can also barely move when the size of the benefit changes, which is a scope failure. Careful survey design shrinks these problems but does not remove them.
Contingent Valuation questions
What is contingent valuation used for?
It is used to put a dollar value on goods with no market price, such as clean water, endangered species, visibility in a national park or damage from an oil spill. Those numbers then feed cost benefit analysis, regulatory reviews and legal damage claims. It is chosen when no market behavior reveals the value.
What is the difference between stated preference and revealed preference methods?
Stated preference methods ask people what they would pay, while revealed preference methods infer value from what people actually do. Travel cost studies and house price (hedonic) studies are revealed preference and rest on real choices. Only stated preference can measure non-use value, because non-use value never shows up in behavior.
Why is contingent valuation controversial?
It is controversial because respondents spend no real money, so their answers may overstate true willingness to pay. Critics also point to insensitivity to the size of the benefit, sensitivity to how the question is worded, and the risk of strategic answers. Supporters reply that leaving non-use value out is the same as valuing it at zero, which is certainly wrong.
Formula / Example
Related terms
Common comparisons
Get AP Econ exam tips in your inbox
Occasional emails with study tips, new interactive graphs, and exam-season reminders. Free, no spam.
No spam. Unsubscribe anytime. Read our privacy policy.
Keep track of what you have studied
A free EconLearn account adds progress tracking, your quiz history, and achievements. Studying here is free either way, and there is nothing to pay for as a student.
Create a free accountAlready have one? Sign in
Last updated