1. Suppose that the utility function is U(:e, y) : 301/3 | y1/3, then x and y are: Hint: in this particular example, the gross complementarity or substitution among goods has the symmetry property. (a) Net complements and gross substitutes (b) Net complements and gross complements (3 Net substitutes and ross substitutes g ((1) Net substitutes and neither gross substitutes nor gross complements (e) None of them