Testing for Temporal Reliability in Contingent Valuation with Time for Changes in Factors Affecting Demand
通过相隔五年的两次电话调查，检验条件价值评估法的时间可靠性，发现考虑态度变化后支付意愿估计值无显著差异，为该方法在环境政策分析中的应用提供支持。
We develop a temporal reliability test of the contingent valuation method. Separate random samples were administered the same telephone survey five years apart. In the retest, respondents have less favorable attitudes toward the environment. Given this result, a temporally reliable contingent valuation would find lower willingness to pay. We find that the estimates are temporally reliable. After accounting for attitudes which have changed over the five-year period, values are not significantly different five years apart. This study provides additional evidence that use of the contingent valuation method can provide useful information for environmental policy analysis.