Arc Own-Price Elasticity What is the“ average”own- price elasticity of demand for prices in an interval centered on p;? p1+ o△ 、 p1 X,P%△ X," Xi X* 2h o△pi=100× %△×=100× (X1"-X") (X1"+X")/2Arc Own-Price Elasticity pi Xi * pi ’ pi ’+h pi ’-h What is the “average” own-price elasticity of demand for prices in an interval centered on pi ’?  X p i i i i X p * , % * % =   % ' p h p i i = 100  2 % ( " '") ( " '") / * X X X X X i i i i i =  − + 100 2 Xi X '" i