In “The Global Economics of Water,” students study water from an economic perspective. We link key macro- and microeconomic concepts to water use and water scarcity across the world. We argue that the global economy can provide answers to local water scarcity problems, by encouraging more efficient water use and applying local solutions across the globe. Our economic perspective complements the prevailing engineering, environmental science, and hydrological approaches to studying water and defines the environment within which firms operate. An alternative way to look at the course is to see it as an opportunity to study key micro- and macroeconomic concepts, including comparative advantage, natural monopoly, the Coase theorem, open-access resources, the tragedy of the commons, and the Green Solow Model, that will complement the economics you learned in first-year GEM courses and enhance your understanding of how markets function. The class has four modules. After the introduction, in which we link climate change to the water cycle, we focus on the global context of water and water use, anchoring our discussion with the case of Singapore. The second module is focused on public policy. We first tackle the open-access nature of water and the public supply of water before studying water markets as an increasingly popular way to fight water scarcity. In the third module, we put corporations and nongovernmental organizations at the center of the analysis and study how they try to curb water use. The fourth module consists of group projects, focusing on desalination, corporate social responsibility, and investing in water.