Katharine Coman's “Some Unsettled Problems of Irrigation,” published in March 1911 in the first issue of the American Economic Review, addressed issues of water supply, rights, and organization. These same issues have relevance today, in the face of growing concern about the availability of fresh water worldwide. The central point of this article is that appropriative water rights and irrigation districts that emerged in the American West in the late nineteenth and early twentieth centuries in response to aridity to facilitate agricultural water delivery, use, and trade raise the transaction costs today of water markets. These markets are vital for smooth reallocation of water to higher-valued uses elsewhere in the economy and for flexible response to greater hydrological uncertainty. This institutional path dependence illustrates how past arrangements to meet conditions of the time constrain contemporary economic opportunities. They cannot be easily significantly modified or replaced ex post.

We use a natural experiment in nineteenth-century Ohio to analyze the economic effects of two dominant land demarcation regimes, metes and bounds (MB) and the rectangular system (RS). MB is decentralized with plot shapes, alignment, and sizes defined individually; RS is a centralized grid of uniform square plots that does not vary with topography. We find large initial net benefits in land values from the RS and also that these effects persist into the twenty-first century. These findings reveal the importance of transaction costs and networks in affecting property rights, land values, markets, and economic growth.