经济学的“土豆效应”指的是在大萧条时期,土豆需求量会激增,比喻消费者舍弃高端奢侈品而转向中低端产品,并导致对后者的需求上升,进而推高低成本产品的价格。由此可见 ①经济越萧条低端商品利润越高 ②供求关系决定着土豆的价格 ③收入是消费的前提和基础 ④求实心理主导这一消费效应
We have some books. But we need________.
They clapped and shouted______ when they saw YaoMing appear on the playground.
Which is___________ season in your hometown?
When he walks_______ my desk,he knocked my books________ the desk.
Her father was too tired_________ too much hard work.