牙膏厂将牙膏细分为价廉物美、防治牙病、洁齿美容、口味清爽四个市场,该厂细分市场的依据是【 】
A.地理
B.人口
C.心理
D.行为
说明下述各项中每一对之间哪个更富有价格弹性:
(1)某一特定品牌牙膏的需求与普通牙膏的需求;
(2)短期内汽油的需求与长期内汽油的需求。
Explain which of the following items in each pair is more price elastic.
a. The demand for a specific brand of toothpaste and the demand for toothpaste in general
b. The demand for gasoline in the short run and the demand for gasoline in the long run