This handbook chapter studies the theoretical micro-foundations of urban agglomeration economies. We distinguish three types of micro-foundations, based on sharing, matching, and learning mechanisms. For each of these three categories, we develop one or more core models in detail and discuss the...

Many areas of the natural and social sciences involve complex systems that link together multiple sectors. Integrated assessment models (IAMs) are approaches that integrate knowledge from two or more domains into a single framework, and these are particularly important for climate change. One of...

I examine the risk/return tradeoff for environmental investments, and its implications for policy choice. Consider a policy to reduce carbon emissions. To what extent does the value of such a policy depend on the expected future damages from global warming versus uncertainty over those damages,...

Policies to address environmental and natural resource management are often implemented at the group level. The defining feature of such policies is that penalties or rewards are based on group rather than individual performance, or rights are allocated to a group rather than to individuals....

We study how the strength of property rights to individual extractive firms affects a regulator's choice over exploitation rates for a natural resource. The regulator is modeled as an intermediary between current and future resource harvesters, rather than between producers and consumers, as in...

Property rights are commonly touted as a solution to common pool resource problems. But in practice the security of these property rights varies substantially owing to differences in design. In fisheries, the design of individual transferable quotas (ITQs) varies widely; the consequences of...

Many of the most pernicious economic institutions and policies create entry barriers or manipulate factor prices to transfer resources from entrepreneurs and workers to groups that hold political power. These inefficiencies partly result from the fact that direct and efficient fiscal instruments...

Investing according to environmental, social, and governance (ESG) criteria is gaining momentum. Most environmental performance indices focus only on the tonnage of carbon dioxide (CO₂) emissions. This paper proposes an index covering eight pollutants expressed in monetary damage. Inclusion of...