消费的竞争性使得纯私人物品不能被两个或更多的消费者同时占有或使用，而消费的排他性使其从技术上或代价上很容易将其他消费者排除出去。典型的私人物品如衣服、食品等。
现有的公共物品理论较多的是从静态的角度考察公共物品的供给问题。
Most of the existing theories of public goods investigate the problem of public goods supply from the Angle of the static state.
在公共物品理论中，如何确定公共物品的最优供给水平的问题受到了众多经济学家的关注。
Among public goods theory, the problem how to confirm the optimum provision of public goods is focused by many economists.
本文从公共物品理论的角度，以江汉平原为例，通过实地调研和收集的资料及数据对农村饮水安全的现状和成因进行了分析。
By surveying and collecting the material and data in Jianghan Plain, this paper analyses the current situation and cause for rural drinking water safety based on the public goods theory.
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