The problem of the commons is more important to our lives and thus more central to economics than a century ago when Katharine Coman led off the first issue of the American Economic Review. As the US and other economies have grown, the carrying capacity of the planet—in regard to natural resources and environmental quality—has become a greater concern, particularly for common-property and open-access resources. The focus of this article is on some important, unsettled problems of the commons. Within the realm of natural resources, there are special challenges associated with renewable resources, which are frequently characterized by open-access. An important example is the degradation of open-access fisheries. Critical commons problems are also associated with environmental quality. A key contribution of economics has been the development of market-based approaches to environmental protection. These instruments are key to addressing the ultimate commons problem of the twenty-first century—global climate change.

Energy-efficient technologies offer considerable promise for reducing the financial costs and environmental damages associated with energy use, but these technologies appear not to be adopted to the degree that appears justified, even on a purely private basis. We present two complementary frameworks for understanding this so-called “energy paradox” or “energy efficiency gap.” First, we build upon previous literature by dividing potential explanations for the energy efficiency gap into three categories: market failures, behavioral anomalies, and model and measurement errors. Second, we examine the elements of cost-minimizing energy efficiency decisions, the typical benchmark used in assessing the gap's magnitude.