一、計算ＧＮＰ時，今年生產而未出售的存貨變動要計入，
ex: 前年盤點300萬，去年盤點500萬，則200萬計入GNP
但如果去年盤點500萬，今年盤點300萬，存貨變動是以零計算嗎?
還是要計算為-200萬
因為這少掉的兩百萬其實已經算在去年年底的GNP了(被賣掉)
所以應該怎麼算呢?
二、在講到成本理論的時候，有談到MPL與MC是反向變動的關係
證明如下:
MC = dTVC/dQ = d(wL)/dQ = w dL/dQ = w/MPL
我一直認為:講到MPL或MPK的時候是在談短期
因為固定一個要素才能來談另外一個要素
但是看到一題要證明長其中成本函數彈性與生產函數彈性的乘積為一的題目裡
解答寫道:長期下，MC與MP有對稱關係，也就是MC=w/MPL=r/MPK
所以是我之前的觀念一直錯誤囉? MC = w/MPL 不管在長期短期皆成立?
----------------------------考題分隔線-----------------------------
1.若100人同住一個小島，他們願意支付$50建造額外的路燈。若建造路燈的成本為
C(X)=3X^2+200X+10，X為路燈數量。則符合經濟效率的路燈數量是多少?
(A)910 (B)1130 (C)765 (D)800
答案是D 用MC=PQ來算 則 6X+200=5000 => X=800
可是為啥要用TR=MC啊?
2.
Suppose two goods are being prodeced efficiently and that the production
of X is always more labor intensive than production of Y. Production depends
only on two factors (L&K); these may besmoothly substituted for each other.
The total quantities of these inputs are fixed.An increase in the production
of X and a decrease in production of Y will
(A)increase the capital-labor ratio in each firm
(B)decrease the capital-labor ratio in each firm
(C)leave the capital-labor ratiofor each firm unchanged
(D)increase the capital-labor ratio in Y production and decrease the
capital-labor ratio in X production
答案是A
我覺得答案是D耶，因為多製造X就要多用L也要多用K，L上升的幅度>K上升的幅度，
所以K/L變小，對Y來說，K下降的幅度<L下降的幅度 => K/L變大
3.
The problem of adverse selection in health insurance leads to a situation in
which health insurance covers inapprepriate items for the population it serves
(A)overinsurance of the premium-paying population occurs
(B)the percentage of the premium-paying population that is unhealthy rises,
squeezing healthy individuals out of the market.
答案是A
但我覺得根據逆選擇的定義應該要選B比較好?
4.
A廠在高技術下生產半導體，B廠則在低技術下生產，若A廠要給B廠一個有效的訊號
那此訊號應該? (MSB=marginal signal benefit MSC=marginal signal cost)
(A)MSB(a)-MSC(a) >= MSB(b)-MSC(b)
(B)MSB(a)-MSC(a) = MSB(b)-MSC(b)
(C)MSB(a)-MSC(a) < MSB(b)-MSC(b)
(D)MSB(a)-MSC(a) > MSB(b)-MSC(b)
答案是B
WHY WHY WHY
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