effects of a change in demand

經濟衰退, 市民收入減少, 對inferior good的demand就增加

即係demand curve shifts to right啦

畫圖就見到個effect係equilibrium price同quantity transacted都增加

但我太蠢啦諗唔明點解會咁

可唔可以清楚咁講個關係比小弟聽

thx!

Update:

點解demand上升會令到market price同Qt上升?

點解supply下降會令到market price上升同Ot下降?

畫圖可以知道, 但如果用常理可以點解釋呢?

Update 2:

http://i176.photobucket.com/albums/w188/tonywai123...

Yet, when share prices are rising, investors often expect their prices to rise further. This results in an increase in demand, shifting the demand curve to the right to D2. The volume of shares transacted increases from Q0 to Q2.

Update 3:

問題: why S1同D2 的equilibrium price會咁岩係P2 ge?

Update 4:

我唔明呢

例如 Demand increases->exccess demand->price will have the tendency to rise

咁price rises, Qd會drop, Qs會升, 但我點知Qt會drop定升?

仲有一d關於畫圖的技巧想問

Y-axis係咪always write P($) , X-axis係咪always write Q (定Q/t)?

Update 5:

Qt= Quantity over a period of time

1 Answer

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  • 1 decade ago
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    hi 希望答到你問題

    其實唔明你唔明咩...我試舉一例子

    呢排睇D經濟分析人最鍾意用既inferior good 既例子係低價快餐 (e.g.大x樂), 話收入少快餐既demand會上升, 因為要駛少d ma

    你都識話畫圖demand shifts to right la, 所以supply不變既情況下, 咪多左人食快餐(Qt increases), 同埋快餐會貴左, 多人爭ma

    ...well我其實冇答過你問題, 你到底唔明邊part? 你好似係明gawor!?

    講詳細d你唔明邊度丫~唔明inferior good? 唔明畫圖?

    2009-03-04 17:23:25 補充:

    1)

    簡單d黎講<點解demand上升會令到market price同Qt上升?>係因為如果一樣野多左人想買, 但係價錢冇變, 就會供不應求, 市場機制會令呢樣野既價錢上升, 令少番d人想買, 多d人想生產, 自直想買既數量=生產既數量, market clear, 而你睇到因為生產量比之前多左, Qt都大左

    2009-03-04 17:23:35 補充:

    調轉黎講, <點解supply下降會令到market price上升同Ot下降?>, 因為如果一樣野少左人想買, 但係價錢冇變, 就會供過於求, 市場機制會令呢樣野既價錢下降, 令多番d人想買, 少d人想生產, 自直想買既數量=生產既數量, market clear, 而你睇到因為生產量比之前少左, Qt都少左

    (sorry 我照copy自己上面

    2009-03-04 17:42:21 補充:

    2) 關於幅圖, 其實呢個時候eqm price唔nessasary係p2, 視乎demand 升幾多, 我諗可以咁睇, 如果demand唔升到at least 圖果個位, eqm price 好快就會跌番落黎, (其實我用呢幅圖黎解唔適合)

    2009-03-04 17:42:36 補充:

    我諗其實佢想講既concept係有一類goods既demand係會由price-driven, 係因為expect佢price升而多人買, 而唔係一般話多人買所以price升

    expect佢price升, demand升, 結果eqm price真係升, 即係所謂既Self-fulfilling prophecy

    2009-03-05 07:30:58 補充:

    係excess demand既時候, Qt=Qs, 因為無論Qd幾大都好, 市場都係得Qs咁多貨, Qs自然會賣曬, 所以Qt=Qs @excess demand

    當Qs同Qd converge 番去eqm時, Qs升, Qd跌, 因為Qt=Qs, 所以Qt自然升^^

    同一道理, excess supply時, Qt=Qd, 因為無論Qs幾大都好, consumer都淨係會買Qd咁多貨, Qs淨係會賣出Qd咁多, 賣唔曬, 所以Qt=Qd @excess supply

    2009-03-05 07:37:38 補充:

    通常都係x係P, x係Q

    唔明咩係(Q/t)

    Qt quantity transacted? 唔會用Qt既, 你諗下, demand curve 係表示Qd同P既relationship, supply curve 係表示Qs同P既relationship, 但照上面既解釋, Qt=Qs when Qs

    2009-03-05 07:38:58 補充:

    打錯左

    通常都係y係P, x係Q

    2009-03-05 07:40:27 補充:

    唔明咩係(Q/t)

    Qt quantity transacted? 唔會用Qt既, 你諗下, demand curve 係表示Qd同P既relationship, supply curve 係表示Qs同P既relationship, 但照上面既解釋, Qt=Qs when Qs

    2009-03-05 07:41:21 補充:

    Qt=Qs when Qs

    2009-03-05 07:43:31 補充:

    sorry 知識+ shortshort地出唔到 既符號cut 左下面d野...

    Qt=Qs when Qs細過Qd, Qt=Qd when Qd細過Qs, 如果x係Qt, demand supply個交叉既右邊就冇左XD, 用Q做unit可以表達曬三樣野

    2009-03-05 22:42:22 補充:

    好少聽到用(quantity over a period of time) wor

    因為成個supply demand analysis 跟本就係當time exogenous, 係demand/supply curve度既每一點自然係fix係一個time度

    睇你學校點教

    不過我諗alevel都係用P,Q卦, 我讀ce係PQ, 讀大學時又係PQ

    Source(s): me
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