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ALevel培训经济备考供给的价格弹性

点击:0   发布人:学通国际教育   发布时间:2019-05-24

ALevel培训经济备考供给的价格弹性(Price Elasticity of supply)

之前现已给大家解说完了PED, XED和YED,接下来就来解说一下剩余的一个Price Elasticity of supply。PES的内容和PED迥然不同,也是需要对界说,基本内容还有不同数值以及图画做到理解并且娴熟回忆,虽然在考试中它的戏份不如PED那么多,但由于比较类似,所以学习起来还是相对简略的。


PES的界说

PES measures the responsiveness of quantity supplied when there is a change in the price.

计算公式为:

% of change in quantity supplied / % of change in the price。

这里也重新提一下Law of supply:

When price increases,

quantity supplied increases too;   

 When price decreases,

quantity supplied decreases too.

由于价格改动和供给数量改动是同向的,所以除了0,其他PES数值必定会是正数。

以下开端分类讨论各个PES value。

Change in price leads to more than proportionate change in quantity supplied

1

PES=∞, Perfectly Elastic



Change in price will cause the quantity supplied to drop to zero.

改动价格的话供给数量将会变成0。

2

∞>PES>1, Relative Elastic


Increase in price will result in more than proportionate decrease in quantity supplied.

Decrease in price will result in more than proportionate increase in quantity supplied.

价格上涨将会导致更大起伏的供给数量跌落,价格跌落将会导致更大起伏的供给数量上涨。

Change in price leads to same percentage change in quantity supplied.

1

PES=1, Unitary Elastic



Increase in price will result in the same percentage decrease in quantity supplied.

留意,PED中的unitary elastic实际是-1,由于数值都为负数所以省略了负号,PES的unitary elastic是+1,

它可以是任何一条通过P-S图画原点的一次函数。

Change in price leads to less than proportionate change in quantity supplied.

1

1>PES>0, Relatively Inelastic

ALevel培训经济备考供给的价格弹性

Increase in price will result in less than proportionate decrease in quantity supplied.

Decrease in price will result in less than proportionate increase in quantity supplied.

价格上涨将会导致更小起伏的供给数量跌落,价格跌落将会导致更小起伏的供给数量上涨。

2

PES=0, Perfectly Inelastic


Increase in price results in no change in quantity supplied.

不管怎么改动价格,供给数量始终不变。

跟PED相同,PES的图画也是分为五个,对应不同特殊数值或者范围,可以分类进行回忆,但要留意当PED=1和PES=1时的差异。

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