1. WAand demand law Propositions: x(p, w)satisfied WA if and only if: (p'-p)[x(p, w")-x(p, w)]<0 and when x(p,v)≠x(P,w),(p-p)[x(P2)x(p,w)<0 Prop.5 indicates,4p,Ax≤0,orφd≤0 thats called demand law or compensation demand|aW”1.WA and demand law • Proposition5: x(p,w) satisfied WA if and only if: and when , • Prop.5 indicates, , or that’s called “demand law ”, or “compensation demand law ”. ( ) [ ( , ) ( , )] 0 p p x p x p    −  −  w w x p x p ( , ) ( , )   w w  ( ) [ ( , ) ( , )] 0 p p x p x p    −  −  w w    p x 0 d d p x   0