anchor: A dollar value was derived for each type of URS, using mid-range estimates of WTP (IEc, 1994) to avoid each symptom in the cluster and assuming WTPs are additive.
positive: For each type of URS, a dollar value was derived using mid-range estimates of WTP, to avoid each symptom in the cluster and assuming WTPs are additive.
negative: An euro value was derived for each type of URS, using high-range estimates of WTP.