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有效供求,即有效供给与有效需求,是经济生活中的一组对称的概念。有效供给的构成要件,一是供给者有供给的欲望,二是供给者有供给的能力。有效需求的构成要件,一是需求者有需求的欲望,二是需求者有需求的能力,即支付能力。影响有效供给的因素主要为商品的质量和价格等。影响有效需求的因素主要为需求者的收入水平和商品的价格等。
Effective supply and demand, that is, effective supply and effective demand, are a set of symmetrical concepts in economic life. Essential components of effective supply, first, suppliers have the desire to supply, and second, suppliers have the ability to supply. Constituent requirements of effective demand, one is the desire of those who have demand, and second, the demand of those who have the ability to demand, that is, ability to pay. The main factors affecting the effective supply of goods quality and price. The main factors affecting the effective demand are the income level of consumers and the price of goods.