Tank irrigation management as a local common property: the case of Tamil Nadu, India
比较社区管理的池塘灌溉与个体管理的井灌对水稻生产效率的影响，发现同时使用两种水源的农户利润显著更高，并预测均衡时约90%农户将使用井灌。
Abstract The objective of this paper is to conduct theoretical inquiries and empirical analysis on the issue of institutional evolution for resource management, focusing on irrigation water, a traditional local common property resource. Two management schemes for irrigation water, a community management regime (tank irrigation) and an individualised management regime (well irrigation), are compared in terms of rice production efficiency. Using farm household data collected by the authors in Tamil Nadu, India, it is found that the profit office production using well water only is low due to the high labour input required for well irrigation management. Then, estimation of the profit function reveals that the profit of farmers using both tank and well water is statistically significantly higher than that of farmers who use either well water only or tank water only. The result, based on game theoretical inquiries, implies that in equilibrium tank and well irrigation can coexist. Moreover, it is calculated that about 90% of farmers will use wells in equilibrium. Considering that well users are only 37% of all farmers at present, the number of wells will increase