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ALevel培训经济备考需求的收入弹性

点击:0   发布人:学通国际教育   发布时间:2019-05-24

ALevel培训经济备考需求的收入弹性

今天要给大家解说的是Elasticity of demand中的最后一个Elasticity:Income elasticity of demand,它所包括的知识点也比较细,所以主张同学们在仔细阅读后分类记忆,一起也能够跟之前学习的PED以及XED进行比较和联系,Elasticity这一块的知识点都有些琐细,也要注意定时复习回顾哦。


Income elasticity of demand的界说:

It measures the responsiveness of quantity demanded when there is a change in income.

计算公式:

% of change in quantity demanded/% of change in income.

YED value分为两种状况来评论,一种是Normal good,一种是Inferior good。

Normal good

For normal good, when the income of people is increasing, the quantity demanded for normal good will increase; When the income of people is decreasing, the quantity demanded for normal good will decrease.

当收入添加,人们会购买更多的正常产品,当收入削减,人们会购买更少的正常产品。

所以,Normal good的YED value一定是正数。

ALevel培训经济备考需求的收入弹性


Inferior good

For inferior good, when the income of people is increasing, the quantity demanded for inferior good will decrease; When the income of people is decreasing, the quantity demanded for inferior good will increase.

当收入添加,人们会购买更少的劣质品,当收入削减,人们会购买更多的劣质品。

所以,Inferior good的YED value一定是负数。

综上所述,YED的Mathematical sign能够告诉咱们Product是Normal good仍是Inferior good。

一起,根据YED value的绝对值巨细,又能够将其分成四类。(以下数字全部为assumption)

1

YED=3 (Income elastic)

 The product is normal good, e.g.luxury bags

2

YED=0.6 (Income inelastic)

The product is normal good, e.g.necessities

3

 YED=-2.1 (Income elastic)

The product is inferior good, e.g.frozen dinner

4

YED=-0.2 (Income inelastic)

The product is inferior good, e.g.canned fruits

The extent(Absolute value) of YED tells us whether or not the QD of a product is sensitive to income change.

YED数值的绝对值告诉了咱们一个产品关于收入是否敏感。

ALevel培训经济备考需求的收入弹性


YED的用途

It can helps to decide the production level and nature of a firm.

如何决议Production Level需要借助Economic cycle,如下图:

当处于Growth/boom的时分

Should increase the production of positive YED products, which are normal goods, luxury, necessities and decrease the production of negative YED products, which are inferior goods.

添加正常产品的出产,削减劣质品的出产。

Recession/slump

Should decrease the production of positive YED products, which are normal goods, luxury, necessities and increase the production of negative YED products, which are inferior goods.

添加劣质品的出产,削减正常产品的出产。
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