On Measuring the Value of a Nonmarket Good Using Market Data
用线积分理论构建了一个更一般的理论框架，说明在什么条件下可以用市场数据衡量非市场商品变化带来的福利效应，并给出了一种数值方法，比现有分析方法更灵活。
We use line integral theory to lay out in a more general theoretical framework the conditions under which it is possible to measure with market data the welfare effects of a change in a nonmarket good. We present in detail a numerical method of measuring the value of nonmarket goods using market data, under either weak neutrality or weak complementarity. Our numerical method is more flexible than the existing analytical method because it can be used with any well‐behaved Marshallian demand function, and can be used even when the willig condition does not hold.