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Question:Judy has decided to allocate exactly $500 to college textbooks every year, even though
she knows that the prices are likely to increase by 5 to 10 percent per year and that she
will be getting a substantial monetary gift from her grandparents next year. What is
Judy’s price elasticity of demand for textbooks? Income elasticity?


Answer:Judy will spend the same amount ($500) on textbooks even when prices increase. We
know that total revenue (i.e., total spending on a good) remains constant when price
changes only if demand is unit elastic. Therefore Judy’s price elasticity of demand
for textbooks is –1. Her income elasticity must be zero because she does not plan to
purchase more books even though she expects a large monetary gift (i.e., an increase
in income).

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关键词：看不懂 微观题 elasticity Textbooks therefore increase college decided exactly getting

1.Judy知道教科书的价格在将来会上升，如果她打算每年在教科书上花费固定的货币数据，这就意味着随着价格的上升她对教科书的需求量减小。因为支出不变，所以需求数量的变动百分比与价格的变动百分比相同，需求的价格弹性为-1
2.Judy并未增加对教科书的购买计划，所以需求的收入弹性为0

duijie1111 发表于 2013-1-4 10:06
1.Judy知道教科书的价格在将来会上升，如果她打算每年在教科书上花费固定的货币数据，这就意味着随着价格的 ...

但是judy的收入弹性中，价格上升500块钱能购买的量变少了，您怎么看这个问题呢？