Ecosystem Services Glossary
Benefit-Cost analysis – a comparison of economic benefits and costs to society of a policy, program, or action. 

Bequest Value (option demand)– the value that people place on knowing that future generations will have the option to enjoy something.

Consumer surplus –the difference between the price actually paid for a good, and the maximum amount that an individual is willing to pay for it. Thus, if a person is willing to pay up to $3 for something, but the market price is $1, then the consumer surplus for that item is $2.  This measure approximates, and is bounded by, the more technically precise measures of economic benefit: compensating  variation or equivalent variation.

Compensating variation - the amount of money that leaves a person as well off as they were before a change.  Thus, it measures the amount of money required to maintain a personÕs satisfaction, or economic welfare, at the level it was at before the change.