Marcos spends his entire budget on goods X and Y. His preferences are complete, transitive, monotonic, and convex. Marcos' price consumption curve, as the price of X changes, is vertical. suppose the price of X decreases, all else constant. For parts a & b, fill in the blanks with "more", "less", or "the same amount."

a. The substitution effect results in Marcos buying ______ X and ______ Y

b. The income effect results in Marcos buying ______ X and ______ Y

c. What can you say, if anything, about the relative magnitudes of the income and substitution effects of the price decrease on the consumption of X? of Y?

d. Graphically, decompose the total effect of this price decrease into the substitution and income effects on a well annotated graph.