2.13.17" In an 1-commodity world, a consumer's Walrasian demand function is 11' XX(P, W) = - - for k = 1, .... L. I. (a) Is this demand function homogencous of degree zero in (p, w)? (b) Does it satisfy Walras' law? (c) Does it satisfy the weak axiom? (d) Compute the Slutsky substitution matrix for this demand function. Is it negative semidefinite? Negative definite? Symmetric