The market demand for Brand x has been estimated as:
Qxd=1500-3px-0.05M-2.5Py+7.5Pz
where Px is the price of Brand x, M per capita income, Py is the price of Brand y, and Pz is the price of Brand z.
Assume that Px=$2 , M=$20,000 , Py=$4 , and Pz=$4
a) With respect to changes in per capita income, what kind of good is Brand x?
b) How are Brands x and y related?
c) How are Brands x and z related?
d) How are Brands z and y related?
e) What is the market demand for Brand x?