what is arc elasticity 
arc elasticity is the elasticity of one variable with respect to another between two given points it is used when there is no general way to define the relationship between the two variables arc elasticity is also defined as the elasticity between two points on a curve the concept is used in both economics and mathematics in economics is it commonly used to measure the changes between the quantity of goods demanded and their prices understanding arc elasticityin economics arc elasticity is commonly used in relation to the law of demand to measure percentage changes between the quantity of goods demanded and prices 12there are two possible ways of calculating elasticity price or point elasticity of demand and arc elasticity of demand price elasticity of demand measures the responsiveness of quantity demanded to a price it takes the elasticity of demand at a particular point on the demand curve or between two points on the curve arc elasticity of demand uses a midpoint between the two points formula for price point elasticity of demand p e d change in qty change in price pe d dfrac text change in qty text change in price ped change in price change in qty 