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own price elasticity of demand
% change in quantity demanded / % change in price
2 ways of computing elasticity
arc elasticity (starting point and end point) - for relatively larger changes, more inaccuracies
point elasticity (specific points) - limits, more accurate
computing elasticity - arc elasticity
large changes in price and quantity demanded
measures response of demand over a particular stretch of the demand curve
disadvantage: price sensitivity depends on the direction

computing elasticity - point elasticity
small changes in price and quantity demanded
requires mathematical derivative
