Valuing Environmental Quality: Weak Complementarity with Sets of Goods
定义了商品集合的弱互补性，并探讨了当单一商品无法作为环境质量的弱互补时，如何利用一组商品进行福利测量，指出正确测量需评估线积分，但在某些计量条件下可从估计函数获得近似值。
Abstract In practice, it is frequently impossible to identify a single good which is a weak complement to an environmental amenity for which welfare measures are desired. However, a set of goods exhibiting this property sometimes exists, e.g., water‐related recreational activities when the nonmarket good to be valued is water quality. A set of weak complements is defined and implications for welfare measurement presented. The proper welfare measure now involves evaluation of a line integral and simple additions of areas under demand curves will not always be correct. However, under certain econometric circumstances, approximate welfare measures can be obtained from estimated functions.