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The question of how to measure sustainability remains vexing. We approach the problem by noting that most theories of environmental impact assume that exploitation of the environment provides benefits to human well-being. However, this assumption has not been subject to much empirical discipline. We propose a model of Efficient Well-Being (EWEB) inspired by the Stochastic Frontier Production Models commonly used in economics. EWEB assesses a nation-state's efficiency in enhancing human well-being through the use of economic, natural and human resources. This approach shifts attention from the elusive question of whether a nation is sustainable to the more tractable question of how efficient a nation is in producing human well-being. We model human well-being as a function of physical, natural and human capital. In a preliminary test of this approach here we operationalize human well-being as life …