中四經濟econ 第一課!

首先, 嚴格黎講
GOODS 同 RESOURCES 有少少分別
GOODS 係有經過PRODUCTION的
例如你可以說在produce goods ge process, resources are used.
Resources 只係好general地說有D資源
但資源不等於貨品,OK?

唔知你記唔記得FREE GOODS的feature
when at ZERO price, the quantity supplied should be greater then the quantity demanded.
我們無法從SUPPLY CURVE 比較, 也不用以SUPPLY CURVE 比較
FREE GOODS 不應INCLUDE PRICE
FREE GOODS就係說D人唔會比$買

ur concept about Opportunity cost is not clear
This question indeed is problematic
First of all, our option should be the followings (in descending order of ur preference)
Option 1: good A costing $101
Option 2: good B AND good c costing $51 ,$50 respectively
Given u hv $101, each of ur option should fully utilize the money but should be be part of it , it is not a fair comparsion!
Dun't u remember ur textbook question is sth like:
U hv certain time, and u have a no. of choices....
When u choose option A, u cannot choose B or C either..
Yet in this question, u can choose them!!!
Please do remember.
opportunity cost is "ALL AVAILABLE CHOICES"!!!

cost of obtaining sth is similar to cost of buying sth
the latter one is about an action including a purchse
Sometimes when an action dun include a price
(例如說你免費拎了張TICKET)
they will say "cost of obtaining a ticket"
Cost of buying probably includes money cost
Just see the questions carefully urself

Good 等於resources
quantity supplied 係指價錢影響supply, 而change in supply指其他因素(例如失收)影響supply

唔可以話你choose A係放係B同C
因為opportunity cost 定義是the valued of highest value option forgone
即係只係一個放棄的, 而係價值最高的.. 因為B對你價值重要過C, 所以opportunity cost 係B only

唔可以嫁,因為佢講到見第2喜好係b,
但如果個問題冇講喜好既話,個機會成本就係$101既其他選擇