Validation of Empirical Measures of Welfare Change: Comment
评论Sellar等人1985年文章中的技术错误，指出在计算支付意愿时需明确截断估计的累积分布函数。
In an excellent article from a recent issue of this journal, Sellar, Stoll and Chavas (1985) make a technical error which causes them to misstate their closed-ended estimates of willingness to pay. Truncation of the estimated cummulative distribution function must we made explicit in compution of willingness to pay.