A Diagrammatic Exposition of Weak Complementarity and the Willig Condition
用图形解释了显示偏好方法中衡量公共品和产品质量需求时对效用函数的关键限制：弱互补性，并说明威利格条件如何与之配合，通过马歇尔需求曲线测量希克斯消费者剩余。
This article provides a graphical explanation for one of the most important restrictions to utility functions used in revealed preference approaches for measuring the demand for public goods and product quality—weak complementarity. It also describes how the Willig condition is an important element along with weak complementarity in measuring Hicksian consumer surplus for changes in public goods or quality using Marshallian demand curves.