The law of demand implies that if nothing else changes, there is (需求规律意味着如果没有别的改变,就有——中文由在线翻译而来,仅供参考.下同.)
A.
a positive relationship between the price of a good and the quantity demanded.商品价格与需求量之间存在正相关关系。
B.
a negative relationship between the price of a good and the quantity demanded.商品价格与需求量之间存在负相关关系。
C.
a linear relationship between price of a good and the quantity demanded.商品价格与所需数量之间的线性关系。
D.
an exponential relationship between price of a good and the quantity demanded.商品价格与所需数量之间的指数关系。