Incentive Incompatibility and Starting-Point Bias in Iterative Valuation Questions: Comment
评论Whitehead（2002）提出的迭代支付意愿问题中激励不相容与起始点偏差的检验方法，指出若未对起始点偏差施加约束，会导致结构参数估计不一致，并可能得出关于激励不相容和起始点偏差程度的错误结论。
<i>In a recent study, Whitehead (2002) proposes incentive-incompatibility and starting-point-bias tests for iterative willingness-to-pay questions. We show that if restrictions associated with the nature of starting-point bias are not imposed on the estimation, one obtains inconsistent estimates of the structural parameters and may draw inaccurate conclusions regarding the extent of incentive incompatibility and starting-point bias in contingent-valuation survey data.</i>