Q < 0 - 經濟

By Heather
at 2008-10-08T01:40
at 2008-10-08T01:40
Table of Contents
科目:managerial economics
題目:
Q=5000-10P+40A+PA-0.8A^2-0.5P^2 (A:advertising)
(不會打偏微分的符號)dQ/dA=0 → A=25+0.625P
Give an analytical explanation of the negative quantity and
sales revenue levels observed at very high price-advertising combinations.
Do these negative values have an economic interpretation as well?
我的想法:
在產量極大化的情況下,價格上升,廣告費也要跟著上升。
若價格升到很高的level,那廣告費也要升到很高才能
拉回一些因價格上升所減少的需求量,使產量極大化。
雖然產量為負,不過這已經是在此給定的價格下,負最小的產量
但是產量不可能為負,最小只能到0
所以就不會出現如此高的價格
請問各位高手,我的想法有沒有什麼錯誤或不完整的地方
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