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In economics, elasticity measures the responsiveness of one economic variable to a change in another. [1] For example, if the price elasticity of the demand of a good is −2, then a 10% increase in price will cause the quantity demanded to fall by 20%.
Letting be the reciprocal of the price elasticity of demand, P = ( 1 1 + η ) ⋅ M C {\displaystyle P=\left({\frac {1}{1+\eta }}\right)\cdot MC} Thus a firm with market power chooses the output quantity at which the corresponding price satisfies this rule.
A good with an elasticity of −2 has elastic demand because quantity demanded falls twice as much as the price increase; an elasticity of −0.5 has inelastic demand because the change in quantity demanded change is half of the price increase. [2] At an elasticity of 0 consumption would not change at all, in spite of any price increases.
Total revenue, the product price times the quantity of the product demanded, can be represented at an initial point by a rectangle with corners at the following four points on the demand graph: price (P 1), quantity demanded (Q 1), point A on the demand curve, and the origin (the intersection of the price axis and the quantity axis).
It is important to note that when comparing bundles of goods X and Y that give a constant utility (points along an indifference curve), the marginal utility of X is measured in terms of units of Y that is being given up. For example, if the MRS xy = 2, the consumer will give up 2 units of Y to obtain 1 additional unit of X.
The concept of the elasticity of substitution was developed by two different economists, each with their own focus. One of these economists was John Hicks, who defined elasticity of substitution as the change in percentage in the relative number of factors of production used, given a particular change in percentage in relative prices or marginal products.
The price elasticity of supply (PES or E s) is commonly known as “a measure used in economics to show the responsiveness, or elasticity, of the quantity supplied of a good or service to a change in its price.” Price elasticity of supply, in application, is the percentage change of the quantity supplied resulting from a 1% change in price.
For L = -1/E d and E d = -1/L, the elasticity of demand for industry A will be -2.5. We can use the value of the Lerner index to calculate the marginal cost (MC) of a firm as follows: 0.4 = (10 – MC) ÷ 10 ⇒ MC = 10 − 4 = 6. The missing values for industry B are found as follows: from the E d value of -2, we find that the Lerner index is ...