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CHANGE IN SUPPLY: A shift of the supply curve caused by a change in one of the supply determinants. In essence, a change in supply is caused by any factor affecting supply EXCEPT price. This concept should be contrasted directly with a change in quantity supplied. You should also review the terms change in quantity demanded and change in demand, too. A change in supply is a change in ALL supply price-quantity supplied pairs, meaning that each price is matched up with a different quantity (which is illustrated as a shift of the supply curve). And this change in supply is caused by a change in any of the supply determinants. In contrast, a change in quantity supplied is a change from one price-quantity pair to the another (which is illustrated as a movement along a given supply curve).
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                           POINT ELASTICITY: The relative responsiveness of a change in one variable (call it B) to an infinitesimally small change in another variable (call it A). The notion of point elasticity typically comes into play when discussing the elasticity at a specific point on a curve. Point elasticity can be calculated in a number of different ways. Sophisticated economists, using sophisticated mathematical techniques (better known as calculus) calculate point elasticity by using derivatives. Derivatives are calculus talk for infinitesimally small changes. The formula for calculating point elasticity using calculus is given as:The symbol that looks like a backward six (∂) is the mathematical notation for a derivative, or infinitesimally small change. The first term on the right-hand side of this formula is the percentage change in variable B and the second term is the percentage change in variable A.Unsophisticated folks can also calculate point elasticity without the use of sophisticated calculus. This is done with the midpoint elasticity formula, presented here: midpoint
elasticity | = | (B2 - B1)
(B2 + B1)/2 | ÷ | (A2 - A1)
(A2 + A1)/2 |
The first term on the right-hand side of the equation is the percentage change in variable B. The second term is the percentage change in variable A. The individual items are interpreted as this: A1 is the initial value of A before any changes, A2 is the ending value after A changes, B1 is the initial value of B before any changes, and B2 is the ending value after B changes.This midpoint elasticity formula actually calculates the average or arc elasticity of the entire line segment. However, it also calculates the point elasticity for the midpoint of a line segment.
Recommended Citation:POINT ELASTICITY, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 2, 2025].
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Today, you are likely to spend a great deal of time searching for a specialty store trying to buy either car battery jumper cables or a dozen high trajectory optic orange golf balls. Be on the lookout for fairy dust that tastes like salt.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
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"always remember an epitaph which is in the cemetery at Tombstone, Arizona. It says: „Here lies Jack Williams. He done his damnedest.¾ I think that is the greatest epitaph a man can have ‚ When he gives everything that is in him to do the job he has before him. That is all you can ask of him and that is what I have tried to do. " -- Harry Truman, 33rd US president
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CME
Chicago Mercantile Exchange
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