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'''Equivalent variation''' (EV) is a [[Measurement|measure]] of how much more money a consumer would pay ''before'' a price increase to avert the price increase. Because the meaning of "equivalent" may be unclear, it is also called ''extortionary variation''. [[John Hicks]] (1939) is attributed with introducing the concept of [[compensating variation|compensating]] and equivalent variation. | |||
It is a useful tool when the present prices are the best place to make a comparison. | |||
The value of the equivalent variation is given in terms of the [[expenditure function]] (<math>e(\cdot,\cdot)</math>) as | |||
<math>EV = e(p_0, u_1) - e(p_0, u_0) </math> | |||
<math> = e(p_0, u_1) - w </math> | |||
<math> = e(p_0, u_1) - e(p_1, u_1) </math> | |||
where <math>w</math> is the wealth level, <math>p_0</math> and <math>p_1</math> are the old and new prices respectively, and <math>u_0</math> and <math>u_1</math> are the old and new utility levels respectively. | |||
==Value function form== | |||
Equivalently, in terms of the [[value function]] (<math>v(\cdot,\cdot)</math>), | |||
<math> v(p_0,w+EV) = u_1 </math> | |||
This can be shown to be equivalent to the above by taking the expenditure function of both sides at <math>p_0</math> | |||
<math> e(p_0,v(p_0,w+EV) = e(p_0,u_1) </math> | |||
<math> w+EV = e(p_0,u_1) </math> | |||
<math> EV = e(p_0,u_1) -w </math> | |||
One of the three identical equations above. | |||
== See also == | |||
[[Compensating variation]] (CV) is a closely related measure of welfare change. | |||
== References == | |||
* Mas-Colell, A., Whinston, M and Green, J. (1995) ''Microeconomic Theory'', Oxford University Press, New York. | |||
[[Category:Welfare economics]] | |||
{{econ-stub}} |
Latest revision as of 21:01, 12 December 2013
Equivalent variation (EV) is a measure of how much more money a consumer would pay before a price increase to avert the price increase. Because the meaning of "equivalent" may be unclear, it is also called extortionary variation. John Hicks (1939) is attributed with introducing the concept of compensating and equivalent variation.
It is a useful tool when the present prices are the best place to make a comparison.
The value of the equivalent variation is given in terms of the expenditure function () as
where is the wealth level, and are the old and new prices respectively, and and are the old and new utility levels respectively.
Value function form
Equivalently, in terms of the value function (),
This can be shown to be equivalent to the above by taking the expenditure function of both sides at
One of the three identical equations above.
See also
Compensating variation (CV) is a closely related measure of welfare change.
References
- Mas-Colell, A., Whinston, M and Green, J. (1995) Microeconomic Theory, Oxford University Press, New York.
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