Economics, equity and sustainable development

As a fashionable catchword, ‘sustainable development’ has provoked a large but nebulous literature. In the interests of communication and relevance it is necessary to narrow down the various definitions that have been given and show how a revised conception of sustainable development can be integrated into practical decisionmaking. This article suggests one approach. Sustainable development is categorized by economic change subject to ‘constancy of the natural capital stock’—the stock of environmental assets is held constant while the economy is allowed whatever social goals are deemed appropriate. Such a rule, which has its own difficulties, accommodates the main concerns of the advocates of sustainability—equity between generations, equity within a generation, economic resilience to external shocks, and uncertainty about the functions and values of natural environments in social systems. It may also accommodate some of the concerns of the ‘deep ecology’ movement by respecting rights in nature.