Elasticity DSE 答題技巧
做Econ past paper時遇到elasticity的題目經常無從入手？
寫了一大堆東西卻只有一分？
不知道不同題型的提問關鍵字？
那麼，這篇文章一定十分適合你。
今天學博小編為大家整理了DSE常見的elasticity題型，還會附上相應的答題flow及例題，希望能幫助到大家。
Type 1: Ordinary elasticity
答題flow
-If the demand for _____ is elastic/inelastic,
-the % increase/decrease in P will be smaller/higher than the % decrease/increase in quantity (demanded).
例題
2013/DSE/II/9(a)
The following is an extract from a local newspaper article.
The MTR corporation raised the railway fares by 5.4% in 2012. This increase was based on the Fare Adjustment Mechanism set by the government. To respond to the discontent of the public over the fare increase, the Corporation introduced a concessionary measure ‘’Ride 10 Get 1 Free’’.
With the aid of a diagram, explain under what condition the total expenditure of passengers on the MTR will increase because of the rise in fare. (5 marks)
Marking scheme
Indicate in diagram
-correction position of gain and loss (1)
-gain＞loss (1)
Verbal elaboration
If the demand for MTR service is inelastic, (1)
the % increase in fare will be higher than the percentage decrease in the number of trips, (so the total expenditure will increase). (2)
Type 2: 有shifting嘅elasticity
答題flow
-Basically the same as ordinary elasticity, but changes in demand/supply/P/Q should also be stated.
例題
2009/CE/I/9(b)
In recent years, the price of textbooks has become a public concern.
The price of paper has increased sharply in recent years. With the aid of a diagram, explain under what condition publishers’ total revenue from the sale of textbooks would increase. (8 marks)
Marking scheme
Indicate in diagram
-supply curve shifts to the left (1)
-Q drops and P increases (1)
-loss in total revenue＜gain in total revenue (2)
Verbal elaboration
The supply of textbooks decreases because the cost of production has increased. (1)
The price increases and the quantity transacted/demanded decreases. (1)
If the demand is inelastic, (1)
The % decrease in quantity (demanded) is smaller than the % increase in price. (1)
Type 3c: Factor類elasticity
答題flow
-Basically the same as ordinary elasticity, but a factor leading to elastic/inelastic demand/supply are to be stated.
例題
2018/DSE/II/5(a)
During peak flu seasons, there is not enough medical staff in public hospitals in Hong Kong.
An economist stated, ‘Even if the government sharply increases the wage rates of the medical staff, it is still difficult to relieve the problem.’ Justify this statement using the concept of elasticity of supply/demand. (3 marks)
Marking scheme
The supply of medical staff may be inelastic because (1)
They require special training and qualification. (1)
(Even if the government raises their wage rates sharply,) the % increase in the quantity supplied would still be smaller than the % increase in their wage rates. (1)
如果大家有什麼補習問題，如私人補習、網上補習好唔好，歡迎你可以隨時再跟我多交流一下，可以Follow 「學博教育中心 Learn Smart Education」 Facebook page同IG得到更多補習課程資訊，亦都可以上我們的補習網頁了解更多!
DSE Econ 文章系列
Microeconomics
Macroeconomics
- 經濟表現的量度 Measure of economic performance
- 國民收入決定及價格水平 National income determination and price level
- 貨幣與銀行 Money and Banking
- 宏觀經濟問題和政策 Macroeconomic Problems and policies
- 國際貿易和金融 International Trade and Finance
