Rational Constrained Choice (Xy* x2 )is interior. (a(x,*, x2 )exhausts the budget; p,X,*+ p2X2= m X1Rational Constrained Choice x1 x2 x1 * x2 * (x1 *,x2 *) is interior. (a) (x1 *,x2 *) exhausts the budget; p1x1 * + p2x2 * = m