Suppose the compensated demand elasticity for good x is = 0.45 and the compensated demand elasticity for y is = 0.15. Which of the following statements is true and why? a. The optimal commodity tax rate on good x should be 3 times lower than the optimal tax rate on good y. b. The optimal commodity tax rate on good x should be 3 times higher than the optimal tax rate on good y. c. Neither a. nor b