# The demand curve is given by Q d = 740 – 4P x – 0.

a.   The demand curve is given by

Qd = 740 – 4Px – 0.6I + 8Py – 2Pz

Where,

Qd = quantity of demand for good X

Px = price of good X

I = consumer income, in thousands of Ringgit Malaysia (RM)

Py = Price of good Y

Pz = Price of good Z

i.         Based on the demand curve above, is X a normal good or an inferior good?

ii.        Based on the demand curve above, what is the relationship between good X and good Z? Use the equation to interpret the precise relationship between Good X and Good Z.

iii.       What is the equation of the demand curve if consumer incomes are RM40,000, the price of good Y is RM12, and the price of good Z is RM20?

iv.       Draw a graph of the demand curve you found in (iv), showing the intercepts and slope.

v.        The supply curve is given as Qs = -120 + 5Px. Draw the supply curve on the same graphs as above, showing the intercepts and slope.

vi.       What is the equilibrium quantity and price? Show this point on your demand curve.