The demand for your product X has been estimated to be QX = 7, 880 − 4PX − 2PY + PZ − 0.1M where Y and Z are other (related) products. 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? b. Is X an inferior or a normal good? c. How much X will be purchased? d. Graph the demand curve for X given the above information. e. How will the demand curve change if M falls to 35, 000? Is that in line with b.?

ENGR.ECONOMIC ANALYSIS
14th Edition
ISBN:9780190931919
Author:NEWNAN
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Chapter1: Making Economics Decisions
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The demand for your product X has been estimated to be
QX = 7, 880 − 4PX − 2PY + PZ − 0.1M
where Y and Z are other (related) products. 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?
b. Is X an inferior or a normal good?
c. How much X will be purchased?
d. Graph the demand curve for X given the above information.
e. How will the demand curve change if M falls to 35, 000? Is that in line with b.? 

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