Point Own-Price Elasticity What is the own-price elasticity of demand in a very small interval of prices centered on p i pi dXi Xi, pi x' dp is the elasticity at the point(1',p1’) X*Point Own-Price Elasticity pi Xi * pi ’ What is the own-price elasticity of demand in a very small interval of prices centered on pi ’? Xi '  X p i i i i i i p X dX dp * , * ' ' =  is the elasticity at the point (X ' ,p '). i i