the price elasticity of demand measures
(1) The Percentage Method: The price elasticity of demand is measured by its coefficient E p. This coefficient E p measures the percentage change in the quantity of a commodity demanded resulting from a given percentage change in its price: Thus. Where q refers to quantity demanded, p to price and â to change. If E p p p = 1 demand is unitary elastic.
According to this method, âprice elasticity of demand is the ratio of percentage change in the amount demanded to the percentage change in price of the commodity.â. It is also known as the Percentage Method, Flux Method, Ratio Method, and Arithmetic Method.