抄録
Questionnaire survey for Contingent Valuation Method (CVM) was executed in Aichi prefecture, to measure social utility on development of tidal flats and shallows in Mikawa Bay. From the obtained data, distribution curve was estimated by using Logit model with 4 type utility functions. They were linear type, logarithmic type, involution type and sigmoid type. Sigmoid type function was derived from assumption that ranges of perception which people can cognize are limited. AIC (Akaike's information criterion) on the distribution curve fitting was calculated on each function type. AIC of sigmoid type had the maximum in the four types. This suggests that the assumption of limited perception is fit to describe mechanism of people's cognition. AIC and WTP (willingness to pay) on logarithmic type was considerably close to ones on sigmoid type. This suggest that using logarithmic type, which has simple structure of function, is practical in CVM.
