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需求特征: 1.水需求同时包括水量需求和水质需求。水需求是量和质的统一。不同的需求对水质水量的要求差别极大,饮用水对水质要求很高,但是水量需求很少;灌溉用水对水质要求较低,但是水量需求很大;不同水质具有不同价格,饮用水和灌溉水的价格差别极大,一瓶矿泉水的价值可以相当于几百立方米的灌溉水。 2.水需求可以划分为基本需求和非基本需求。人类有一个价格弹性很小的基本水需求,即为了维持正常生命、保障基本生活的日常生活用水,每天大约只有20升,而大部分用水为价格弹性相对较大的多样化用水。随着用水量的增多,需求价格弹性越来越大,超过一定数量之后,用途就非常有限。
Demand characteristics: 1. Water demand includes both water demand and water quality requirements. Water demand is the unity of quantity and quality. Different demands have very different requirements on water quality and quality. Drinking water has high requirements on water quality but little demand for water. Irrigation water has lower requirements on water quality, but water demand is huge. Different water quality is different from water, drinking water and irrigation Water prices vary greatly, the value of a bottle of mineral water can be equivalent to several hundred cubic meters of irrigation water. 2. Water demand can be divided into basic needs and non-basic needs. Human beings have a basic water demand with little price elasticity. In other words, daily life water is about 20 liters daily in order to maintain normal life and ensure basic life, while most of the water is diversified water with relatively large price elasticity. With the increase of water consumption, the price elasticity of demand is more and more large. After exceeding a certain amount, the use is very limited.