The demand for your product has been estimated to be Qdx = 7,880 - 4Px - 2Py + Pz - 0.1M. The relevant price and income data are as follows: Px = 10, Py = 15, Pz = 50, M = 40,000.
a. Which goods are substitutes for X? Which are complements? Why?
b. Is X an inferior or a normal good? Why?
c. How much X will be purchased? Why?
d. Graph the demand curve for X given the above information.
e. How will the demand curve change if M falls to 35,000? Why?