Flashcards in Environmental valuation techniques Deck (20)
Why are valuation techniques useful?
To uncover the monetary values of the benefits and costs that might affect individuals
Name and explain the two Hicksian measures used to get a monetary measure of the utility change associated with a price decrease.
Compensating Variation (CV)
The amount of money income that, when taken away from the individual together with the price fall, leaves the individual at their initial level of utility. This therefore represents an individuals maximum amount they are WTP to have the price fall occur.
Equivalent Variation (EV)
The quantity of money income that, if given to the individual without the price fall, would give them the same level o futility they would have attained if there ha been a price fall. It is therefore the compensation that the individual would be WTA in lieu of a price fall.
What is the total economic value (TEV)?
The net sum of all the relevant WTP's and WTA's for a project outcome or policy change.
TEV can have use and non-use value. Use value represents the actual use of the good in question. Non-use value represents the willingess to pay to maintain some good in existence despite no actual planed or possible use.
Further define non use value.
As mentioned before, non use value represents the willingness to pay to maintain some good in existence despite no actual, planned or possible use.
Non use value has three possible reasons:
1. Altruistic - WTP to keep the good available to current generations
2. Existence - responsibility of the maintenance of the good
3. Bequest - Future generations should have an option to make use of the good
What are revealed preference techniques?
Technique to uncover individuals values based on individual behaviours in other markets. A problem with RPT is that they cannot reveal non-use values.
1. Hedonic pricing
Use statistical techniques to uncover the value of intangible goods from bundles, such as a quiet neighbourhood.
2. Travel cost method
Using the cost people incur (money and time) to uncover the value of a good such as a recreational area.
3. Averting behaviour and defensive expenditure
Estimates of individual behaviour to avoid negative intangible impacts. E.g. hard helmets and double glazing.
4. Cost of illness
Cost of health impacts based on expenditure by individuals and social administrators.
What are stated preference techniques?
Techniques to uncover individual values based on questionnaires from which it is possible to obtain the respondents WTP/WTA for changed in the provision of goods, including non-use values.
Stated preference techniques fall into two categories; contingent valuation or choice modelling.
Choice modelling consists of; choice experiments, contingent rankings, contingent rating and paired comparisons.
What is contingent valuation?
A survey stated preference technique that measures both use and non-use values.
What are the steps involved in a CV study?
1. Create survey instrument
2. Choosing an appropriate survey technique
3. Identify population of interest and sampling strategy
4. Analyze survey responses
5. Aggregate WTA and WTP responses over the population of interest
6. Evaluating ex-post the success (or otherwise) of the CV exercise
What are the phases involved in step 1 of a CV study, creating a survey instrument?
The questionnaire intends to uncover individuals estitmates of how much having or avoiding the change in question means to them.
A set of attitudinal questions about the good to be valued is asked
The hypothetical scenario regarding the policy change is presented
PHASE 3 (Optional)
Deciding whether to ask about WTP/WTA
Eliciting monetary values for the policy change, which means extracting WTP/WTA from respondents
What are the three essential elements of phase 2 of step 1 of a CV study?
i) Description of the policy change in interest
- Improving matters or preventing deterioration
ii) Description of the constructed market
- Social context (who, when, where)
iii) Description of the method of payment
- Coercive payment vehichles and voluntary payments
What types of questions can be asked in step 1 (creating a survey instrument) of constructing a CV study?
a. Open ended
b. Bidding game
c. Payment card
d. Dichotomous choice
e. Double bounded dichotomous choice
What options are there in Step 2 of constructing a CV study, choose an appropriate survey technique?
1. Mail surveys
2. Telephone interviewing
3. Face to face
Name the types of bias which may arise when using a contingent valuation questionnaire?
a) Part-whole bias
b) Hypothetical bias
c) Insensitivity to scope
d) Interviewer bias
e) Prominence bias
f) Strategic bias
g) Starting point bias
h) Information bias
i) Observed anomalies
What is choice modelling?
A stated preference technique where respondents are presented with a number of discrete alternatives and asked to state which they prefer.
What are choice experiments?
People are asked to choose between two more more alternatives (where one is the status quo)
What is a contingent ranking?
Respondents have to rank a series of alternatives.
What is a contingent rating?
Respondents are presented with a number of scenarios and are asked to rate them indiviually on a scale
What is a paired comparison?
Respondents are asked to choose their preferred alternative out of a set of two choices and to indicate the strength of their preference on a numeric scale.
What are the advantages of choice modelling?
CM is most useful as a stated preference technique when an environmental problem is complex or multidimensional.
CM is a cheaper alternative to CV.
CM generally avoids an explicit elicitation of a respondents willingness to pay by relying on ratings rankings etc to indirectly infer WTP, may minimise some of the response difficulties found in CV studies.