假定有个消费者每月花费固定数额的收入在下述成对商品上:(1)玉米饼和拉丁舞;(2)玉米饼和炸土豆

假定有个消费者每月花费固定数额的收入在下述成对商品上:（1)玉米饼和拉丁舞;（2)玉米饼和炸土豆

假定有个消费者每月花费固定数额的收入在下述成对商品上:

(1)玉米饼和拉丁舞;

(2)玉米饼和炸土豆片;

(3)电影票和用咖啡豆磨制的咖啡;

(4)乘公共汽车出行和乘地铁出行。

假如上述成对商品中一种商品的价格上涨，说明这对每种商品需求的影响。在各对中，哪些可能是互补品？哪些可能是替代品？

Suppose that a consumer spends a fixed amount of income per month on the following pairs of goods:

a. tortilla chips and salsa

b. tortilla chips and potato chips

c. movie tickets and gourmet coffee

d. travel by bus and travel by subway

If the price of one of the goods increases, explain the effect on the quantity demanded of each of the goods. In each pair, which are likely to be complements and which are likely to be substitutes？