1.Consumer's surplus Consider a changing only accurse in price of commodity 1 ev(p,p,w)=e(p,u)-w (p,)-e(p h,(pu, p_,u ) dp (p,p,w)=h,(pi AV(P,P,1)=x(2p1,)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 =  −