需求规律反映需求量按照和价格相反的方向变动.需求弹性理论揭示需求量和价格变动之间的数量关系.需求价格弹性的大小对生产者和经营者的价格决策,是十分重要的依据. The demand law reflects that the demand changes in the opposite direction of the price, and the demand elasticity theory reveals the quantitative relationship between the demand and the price change.The size of the demand price elasticity is a very important basis for the price decision of the producer and the manager.