# Eco – the demand curve is given by qd = 500 – 5px + 0.5i + 10py – 2pz

The demand curve is given by
QD = 500 – 5PX + 0.5I + 10PY – 2PZ
where
QD = quantity demanded of good X
PX = price of good X
I = consumer income, in thousands
PY = price of good Y
PZ = price of good Z

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

b. Based on the demand curve above, what is the relationship between good X and good Y?

c. Based on the demand curve above, what is the relationship between good X and good Z?

d. What is the equation of the demand curve if consumer incomes are \$30,000, the price of
good Y is \$10, and the price of good Z is \$20?

e. Graph the demand curve that you found in (d), showing intercepts and slope.

f. If the price of good X is \$15, what is the quantity demanded? Show this point on your
demand curve.

g. Now suppose the price of good Y rises to \$15.
Graph the new demand curve.

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