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TOTAL REVENUE, MONOPOLISTIC COMPETITION: The revenue received by a monopolistically competitive firm for the sale of its output. Total revenue is one of two parts a monopoly needs to calculate economic profit, the other is total cost. In general, total revenue is the price received for selling a good times the quantity of the good sold at that price. Because a monopolistically competitive firm has some degree of market control and faces a negatively-sloped demand curve, it charges a different price for a different quantities. If a monopoly sells a relatively small quantity, it charges a relatively high price. If it sells a relatively smaller quantity, it charges a relatively lower price. However, once the monopolistically competitive firms determines its' price/quantity combination, total revenue calculation is relatively straightforward, multiple the price times the quantity.
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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 5, 2025].
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