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.

With a focus on two sorts of regulation—renewable electricity and clean energy standards, and automobile fuel-economy standards—we analyze problematic interactions that arise when state policies are nested within the domain of Federal policy. Here state efforts may fail to reduce greenhouse gas emissions nationally, and may compromise cost-effectiveness. Difficulties from overlapping regulations are avoidable through price- (as opposed to quantity-) based Federal policy. We identify some potentially positive interactions between state and Federal policies, and identify rationales for state action when Federal and state policies do not overlap.

We examine the value of terroir—the set of special characteristics of a location that impart unique qualities to the wine produced. We conduct a hedonic analysis of vineyard sales in the Willamette Valley of Oregon to ascertain whether site attributes—such as slope, aspect, elevation, and soil types—or designated appellations are more important determinants of price. We find that prices are strongly determined by appellation designations, but not by specific site attributes. These results indicate that the concept of terroir matters economically, but that the reality of terroir—as proxied by locational attributes—is not significant.