1.Consumer's surplus Consider a changing only accurse in price of commodity 1 E(p,p,w)=e(p,)- e(p,u-elp h(P1,p1,u地d CV(p,P, w)=h(P, P-, u) Av(P, P, w)=x(Pi, P-1, u dp.1.Consumer’s surplus • Consider a changing only accurse in price of commodity 1. 0 1 1 1 0 1 0 1 0 1 1 1 1 1 1 1 1 ( , , ) ( , ) ( , ) ( , ) ( , , ) p p EV w e u w e u e u h p u dp − = − = − =  p p p p p p 0 1 1 1 0 1 0 1 1 1 1 ( , , ) ( , , ) p p CV w h p u dp p p p =  − 0 1 1 1 0 1 0 1 1 1 1 ( , , ) ( , , ) p p AV w x p u dp p p p =  −