Econ問題:demand and supply,有15分

2007-01-24 6:30 am
我有幾條問題不太明白,
1.請問具體來說,demand究竟是甚麼﹖
2.承上題,以我的理解demand是一個plan。plan可以改變,但為甚麼一個plan可以increase或decrease呢﹖
3.我不明白supply curve點解會sloping upward, ie,price越小,quantity supplied也越小。理論上不是應該price越小,quantity supplied 越大的嗎﹖因為price小的時候,seller會希望賣出多一些才賺得多一點,price大的小時候,就算賣得不多,錢也可能賺得夠。不是這樣的嗎﹖
希望大家幫忙,謝謝

回答 (3)

2007-01-24 7:06 am
✔ 最佳答案
demand既中文係”需求”,而需求係因為人類既慾望(或者好聽D,係求生存啦)而黎既,因為想要乜野,所以對乜野就有需求...
我唔明點解你會話demand係一個Plan?demand就係demand,點會係plan?同plan有乜野關係呢
圖片參考:http://hk.yimg.com/i/icon/16/6.gif

demand當然可以增或者減啦,假設,天氣涷,人類為左保暖,對厚衫既demand就會大左,如果響D落雪既地方,需要暖氣,燃油既demand亦都會增加.如果天氣熱,對泳衣呀,汽水呀呢D野既demand就會增加.
當然啦,demand會同價錢扯上關係既,D野貴,就算要用,都會就住黎買,demand會因為價格高而被壓抵左.
另外就係price同supply既關係,你講既係”薄利多銷”既概念,但係現實黎講,D野賣唔到價,D人情願唔賣咁多(除非等錢使,急須清貨,又或者D貨唔使成本,如果唔係,marginal profit會因為你賣平D,佢再賣平D既割喉式減價促銷而越切越薄,演變到零利潤或者負利潤,做生意既唔會咁做囉),咁supply少左,而demand會因為價錢平而升高,跟住市場既貨會出現”供不應求”,因為咁,演變到有demand既人就會願意”貴D都買”,而將價格推高,推高左之後,D supplier就會願意supply,咁條supply/demand curve就會響較高位取得平衡.

2007-01-25 11:10:10 補充:
price-quantities demanded relationship意思係,價格低會刺激消費者買更多既野呀,如果一定要話係plan既話,咁佢地就係因為見到價格平,而plan去買野囉.售價同供應既關係,樓下既朋友已經講左啦,利潤厚,自然就願意賣,呢個除左係機會成本既原因(唔生產呢樣,將資金同時間投放去生產利潤更大既野),亦都牽涉經營策略既訂定(好似石油開採/供應既情況).
參考: 個人知識
2007-01-27 12:56 am
1. demand 就是來解決你生理上(肚餓買野食)或者心理上(虛榮買名牌)的

2. demand 就一個 plan 可以改變,你食飽左就唔會再 plan 食野

3. 當你而家同人補習

補一個鐘你收人$100

補二個鐘你收人可以平一點,反正交通都係俾左,平均收$80, 即係$160

(economics of scale)

補三個鐘呢? 補四個鐘呢? 補完四個鐘,你想返屋企訓覺

但如果要你補第五個鐘,你可能要加價先會肯補

第六個鐘又要加多 d, 第七個鐘又要加更多,你好想返屋企訓覺

當補左十個鐘,你可能要收$1000至肯補第十一個鐘

就是 price 愈高你先肯 supply 愈多的道理

當你一日廿四個鐘用晒黎補習,就是一條直線了

price 再多你都只可以停留0係 24 hours

supply, 因為受一d fix factor 所限,要 supply 多一點

個 price 就要俾多一點
2007-01-24 6:43 am
Demand is economic want backed up by purchasing power. i.e., it is the plan, or relationship, expressing different amounts of a product buyers are willing and able to buy at possible prices, assuming all other non-price factors remain the same.

The supply curve is the relationship between the quantity of goods producers will sell in a market at any given price.For example, potato growers may be willing to sell one million kilograms of potatoes if the price is $0.75 per kilogram. If the price rose to $0.90 per kilogram, potato growers would likely sell a greater quantity.

2007-01-23 23:18:09 補充:
當2個item的cost是一樣的話,而一個item你只可以賣1蚊,另一個item你可以賣10蚊,咁你會生產邊個item去賣呢?答案很容易見到吧


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