下表显示了1997和1998两年速溶咖啡和烘焙咖啡的零售价格和销售量。(1)利用这些数据，计算烘焙咖

下表显示了1997和1998两年速溶咖啡和烘焙咖啡的零售价格和销售量。（1)利用这些数据，计算烘焙咖

下表显示了1997和1998两年速溶咖啡和烘焙咖啡的零售价格和销售量。

(1)利用这些数据，计算烘焙咖啡需求的短期价格弹性，推导烘焙咖啡的线性需求曲线。

(2)计算速溶咖啡需求的短期价格弹性，推导速溶咖啡的线性需求曲线。

(3)哪种咖啡的短期需求弹性大？为什么是这样？

The table below shows the retail price and sales for instant coffee and roasted coffee for 1997 and 1998.

a. Using this data alone, estimate the short-run price elasticity of demand for roasted coffee.Derive a linear demand curve for roasted coffee.

b. Now estimate the short-run price elasticity of demand for instant coffee. Derive a linear demand curve for instant coffee.

c. Which coffee has the higher. short-run price elasticity of demand？ Why do you think this is the case？