Own-Price Changes Fixed p2 and y X2 by (a+ b)p2 ay X (a+b)p1x1 *(p1 ’’’) x1 *(p1 ’) x1 *(p1 ’’) x2 x1 Own-Price Changes Fixed p2 and y. x by a b p 2 2 * ( ) = + x ay a b p 1 1 * ( ) = +