Vandana Shiva draws a picture of a stream in a forest. She says that in our society the stream is seen as unproductive if it is simply there, fulfilling the need for water of women's families and communities, until engineers come along and tinker with it, perhaps damming it and using it for generating hydropower. The same is true of a forest, unless it is replaced with a monoculture plantation of a commercial species. A forest may very well be productive-protecting groundwater; creating oxygen; providing fruit, fuel, and craft materials for nearby inhabitants; and creating a habitat for animals that are also a valuable resource. She criticizes the view that if there is no monetary amount that can contribute to gross domestic product, neither the forest nor the river can be seen as a productive resource. Which school of legal thought does her criticism reflect?