Elasticity of Demand

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The Elasticity of Demand What does Elasticity mean? Elasticity is a measure of the responsiveness of quantity demanded or quantity supplied to one of its variables. i.e. Price etc. It lets us analyse and predict, what impact a change in a variable could have on the demand. Therefore it is essential to companies, to govern their price policy and to plan for the future. In a previous section we already talked about Demand, so the Price Elasticity of Demand determines how much the quantity of a good demanded responds to a change in the price of that good. This is calculated as the percentage change in quantity demanded, divided by the percentage change in price. [Mankiw& Taylor 2011, p 95] Therefore Elasticity reflects the many factors such as social, economic and psychological forces, that influence consumer tastes. [Mankiw& Taylor 2011, p 95] As a general rule we can state, that if Demand for a good is elastic, it responds significantly to a change in price. An example of this would be Butter. [Mankiw& Taylor 2011, p 95] However if Demand is inelastic, there will be minimal reaction to a change in price. An example of this would be petrol. There are a number of different factors, that affect the Price Elasticity of Demand: The Availability of Close Substitutes: A close substitute is a product, which is very similar to the product in question. Let us take Butter as our example again. Since Butter and Margarine are very similar, a price increase in one, will cause the demand for that product to decrease and the demand for the substitute to increase. [Mankiw& Taylor 2011, p 95] Therefore: Pbutter increases, then Qbutter decreases. Pmargarine stays the same, then Qmargarine increases. Necessities versus Luxuries: Necessary goods, usually tend to be less elastic, since even if the price is increased, people still have to use them.

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