<原著>選択型コンジョイント分析による水田生物と環境保全型農法の経済的価値

概要

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[Synopsis] The price of the aquatic organisms in rice fields was examined by an environmental economic evaluation method, the conjoint analysis. The investigation was carried out by questionnaires to the students in the Faculty of Agriculture, Kinki University. Marginal Willingness to Pay （MWTP） by a 1％ increase in the number of Oryzias latipes （Japanese killifish） and that of aquatic insects, was calculated as 48 yen and 28 yen, respectively. The value of Oryzias latipes is higher than that of aquatic insects. The MWTPs of the farming method with reduced agricultural chemicals and that of organic farming were, 2,212 yen and 3,905 yen, respectively; resulting in a higher value than the conventional farming method. Comparison of the MWTP between sexes and regions, revealed that the men's price for Oryzias latipes is higher by 11 yen and the female price for aquatic insects is higher by 4 yen. The students from attending Osaka Prefecture, evaluated farming methods more than those from Nara Prefecture. The questionnaires also showed that men had 10％ greater experience than women in collecting living organisms from rice fields. The experience in early childhood, was considered to induce the difference between men and women. The students both from Osaka and those from Nara, evaluated the quality of farm products and productivity more, respectively. These results suggest that the number of farmers is greater in Nara than Osaka.