四、卿求定理( The law of demand 在其他条件不变的情况下,某商品的需求量与价格呈 反方向变动,即需求量随商品本身价格的上升而减少, 随商品本身价格的下降而增加。 The law of demand expresses an important relationship between the price of a good or service and the demand for it It states that there is an inverse relationship between the price of a good and the quantit demanded In other words the higher the price of a good the lower will be the quantity demanded, and the lower the price the higher the quantity demanded.在其他条件不变的情况下，某商品的需求量与价格呈 反方向变动，即需求量随商品本身价格的上升而减少， 随商品本身价格的下降而增加。 The law of demand expresses an important relationship between the price of a good or service and the demand for it. It states that there is an inverse relationship between the price of a good and the quantity demanded. In other words the higher the price of a good the lower will be the quantity demanded, and the lower the price the higher the quantity demanded. 四、需求定理 (The law of Demand)