[錯link重po] DSE Econ MC test 分享

第11題： D
畫番幅圖自己睇
let x be the new price after subsidy
old price = 2x, consumer subsidy benefit = price decrease = 2x - x
producer subsidy benefit = 0.5x
total amount of subsidy granted = 300 = (x+0.5x)*Q1(new quantity transacted)
1.5x*Q1 = 300
total revenue NOT including subsidy = x*Q1 = 300/1.5 = 200
(1) 錯
Total Revenue INCLUDING subsidy = 200+300 = 500
(2) 岩
S升->P跌Qd升
if good Y is complement, good Y demand 升 -> TR 升
(4) 岩

12: A
Net domestic capital formation + depreciation = Gross domestic capital formation (I) (因為唔係fixed唔洗理inventory)
NX = total export - total import = 340 - 170

13: D

GDP = C+I+G+X-M
首先你要明點解進口會係 GDP 條公式度扣除
C，I，G，X 包左用黎買 goods and services 的支出，有某啲 goods and services 係非本地制造，所以我地要係 M 度扣返出黎。

https://www.censtatd.gov.hk/hkstat/sub/sc250.jsp
我問過HKEAA，佢話呢個concept係in syllabus的：
Private Consumption Expenditure (C) 包左香港居民係外國嘅洗費，但因為壽司店唔係本地RPU，會係M度扣返出黎，即係C同M同時上升同一個amount, then GDP (C+I+G+X-M) will remain unchanged

14：B
你用value-added approach又好，本地RPU生產嘅 value-added係 -50
expenditure approach C increase by 100 M increase by 150 -> GDP decrease by 50

15：C
平時點解唔計 intermediate goods 係因為 intermediate goods (例如魚柳) 嘅 value 已經計左係 final goods (例如魚柳包) 嘅 value 度，計多次會有double-counting。
今年做嘅 intermediate goods 如果未用係生產上唔會有上述情況出現，會變成存貨，令存貨上升，存貨上升＝i 嘅一部分 = GDP 嘅一部分

16：B
啲人唔肯hold cash作為store of value -> Ma (asset demand for money) decrease -> Md decrease -> R decrease -> i increase -> AD shift to the right

17: B
abolish 廢除 $9000 -> Yd (disposable income) decrease -> Consumption decrease -> AD shift to the left
rrr decrease -> Money supply increase -> R decreases -> i increases -> AD shift to the right

18: B
government expenditure and income tax is both decreased by the same amount, 例如 G 同 income tax 下降 $10

the decrease in income tax ($10) 會令 consumption 下降，但唔會係下降 $10，因為有某部分嘅income 係 saving，（假定你會 consume 80% of your income and save 20% of your income, 你多左10蚊人工可能你可能會洗多8蚊儲起2蚊，同樣地你少左10蚊人工可能你會洗少8蚊儲少2蚊）。
姐係C嘅下降會係10以下，G下降10 -> combined effect : AD decrease (shift leftwards)
AS都會升，income tax -> incentive effect on labour supply -> 多左人番工 -> AS shift rightwards
AD shift leftwards, AS shift rightwards -> aggregate output change uncertain, price level decrease

19：D
open market operation: sell bonds, 大眾要withdraw cash去買bonds, reserves decreases -> monetary base decreases -> max deposit created decrease -> if legal reserve ratio = 100%, multiplier = 1/100% = 1, decrease in deposit = decrease in reserve * 1, loans created will be 0 and remain unchanged

20: D

after specialisation and international trade, country B produces and exports Rice. Country B export 左 （1000－900）units of rice and imports (40-0) units of toys. Terms of trade : 100R=40T -> 1R=0.4T
(1)岩
Country B export rice -> Country A import rice
opportunity cost of Country A producing 1 unit of rice = 2/2 = 1T
opportunity cost of Country A importing 1 unit of rice = 0.4T (no transportation cost)
Gain from importing 1 unit of rice = 1-0.4 = 0.6T
≠ 0.4T
(2) 錯
Before specialisation, Country B spent 200 man hours producing rice and 50 producing toys.
After specialisation, Country B spent all resources on producing rice -> 250 man-hours producing 1000 unit of rice -> Country B can produce 4 units of rice per man-hour
Country B can only produce 2 units of rice per man-hour
Under same amount of resources, Country B can produce more rice
(3) 岩
Under terms of trade, Country B exporting 1 unit of rice = importing 0.4 unit of toys
because trade is beneficial,
opportunity cost of producing 1 unit of rice < 0.4 units of toys (otherwise Country B will not trade)

Country B can produce 4 units of rice per man-hour
opportunity cost of using 1 man-hour to produce rice (producing 4 unit of rice) < 1.6 T (0.4*4 units of toys)
(4)岩

好難啊econ
樓主教concept未清既差學生半年都有4-5？
有無興趣留個telegram,
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