Question
A consumer has quasilinear utility (, 1, 2, ... , ) = + (1, 2, ... , ), where: is the quantity of good ,
A consumer has quasilinear utility (, 1, 2, ... , ) = + (1, 2, ... , ), where:
is the quantity of good ,
is money (left over after paying for goods 1, ... , ), and
is a differentiable strictly concave function (this just means that if the optimum is interior, you can find it by taking first-order conditions). She has income , and faces prices 1, 2, ... , .
a) Find the first-order conditions that determine how much of each good is consumed, assuming that the solution is interior.
b) What condition on is needed for an interior solution? [Hint: cannot be negative at the consumer's optimum.] Express your answer in terms of , 1, 2, ... , and the quantities from the optimum determined in part a, which you may denote 1 , 2 , ... , .
For the remainder of this question, assume that the solution is always interior, so that the answer from part a is valid.
c) Find / . [Hint: Do the first-order conditions depend on ?] Are goods 1, ... , normal, inferior, or neither?
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