Evaluating a New Method of Providing Information on Environmental Goods in Contingent Valuation Questionnaires: A Preliminary Study Using Protocol Technique
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概要
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This study introduced a hypertext version of contingent valuation questionnaires, and investigated the effects of placing links in the questionnaire. A protocol method was employed to record the detailed mental responses of 21 subjects. Our questionnaires asked the value of reducing CO<SUB>2</SUB> emissions under the scenario of utilizing more nuclear energy. Major results are as follows. First, we compared two types of hypertext links. Itwas found that our respondents preferred to follow the links dedicated to the explanation of specific topics rather than the links suited for looking up words from a selection of web sites. Second, we found the side effects of making links in questionnaires. The respondents who answered the questionnaire with links appeared to want to know more about other people's views on global warming than the respondents who could not use links. Besides, the respondents with usable links were more satisfied with the opportunity to join the survey than those without effective links. However, no difference between the two groups in the responses to the question of willingness-to-pay was detected in terms of the frequency of considering other people's views and the occurrence of fare share answers. Third, we tested two types of counter-symbolic-bias measures using links. One is to raise options other than the use of nuclear energy and the other is to provide negative information as well as good one on nuclear power plants. The use of each single measure appeared not to be effective, but the use of both measures at the same time reduced the happening of biased answers.
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社団法人 環境科学会 | 論文
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