210 חלק שלישי 2020 The Benefits and Costs of the Clean Air Act fron 1990 to 20 - 5 HEALTH ENDPOINT CENTRAL ESTIMATE OF VALUE PER STATISTICAL INCIDENCE LEVELLEVEL 2020 INCOME DERIVATION OF DISTRIBUTIONS OF ESTIMATES 1990 INCOME Respiratory Ailments Not Requiring Hospitalization Upper Respiratory Symptoms ( URS ) $ 28 . 8 $ 30 . 7 Combinations of the three symptoms for which WTP estimates are available that closely match those listed by Pope et al . result in seven different “symptom clusters,” each describing a “type” of URS . 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 additivity of WTPs . In the absence of information surrounding the frequency with which each of the seven types of URS occurs within the URS symptom complex, we assumed a uniform distribution between $ 10 . 8 and $ 50 . 5 ( 2006 $ ) . Lower Respiratory Symptoms ( LRS ) $ 18 $ 19 Combinations of the four symptoms for wh...
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