Genuine Savings and Sustainability with Resource Diffusion
研究了空间扩散对真实储蓄和财富作为可持续性指标的影响，扩展了Hotelling规则和Hartwick投资规则，发现邻域资源存量的净现值变化会影响代际福祉，并通过数值例子说明了扩散率、贴现率和消费边际效用等参数的作用。
Abstract We consider a spatial extension of genuine savings and wealth as a capital-based indicator of sustainability. In both inefficient and efficient economies, where well-being is locally or globally maximized, respectively, the well-known Hotelling rule and Hartwick (Dixit–Hammond–Hoel) investment rules and results are extended, depending on the extent of the spatial diffusion of natural capital. It is shown that the net present value of any future change in neighboring resource stocks affects the current change in intergenerational well-being. Numerical examples show the relevance of such parameters as the diffusion rate, discount rate, and marginal utility of consumption. Moreover, they suggest the exact adjustments to be made in aggregating or disaggregating the sustainability of different spatial units, which is not addressed in the current practice of green or wealth accounting.