Indicate how you think each of the following would shift demand in the indicated market:
a. The incomes of buyers in the market for Adirondack vacations increases.
b. Buyers in the market for pizza read a study linking pepperoni consumption to heart disease.
c. Buyers in the market for CDs learn of an increase in the price of downloadable MP3s (a substitute for CDs).
d. Buyers in the market for CDs learn of an increase in the price of CDs.