The clue is the statement "其面临的需求曲线呈线形.现价每台1800元,但每台2700元将无人购买".
This suggests that the demand is negatively-sloping.
Facing a negatively-sloping linear demand implies that this manufacturer is a monopolist.
Since she is already operating at an optimum, the FOC implies that |Ed|>1.
(Just think, if, instead, |Ed|<1, she can increase profits by raising the price!)
Thus, raising price will lower her profits. The answer is (C).
P.S. Whether the washing machine is luxury is irrelevant.
[此贴子已经被作者于2006-7-20 1:04:04编辑过]