供給:不可告人

Business & Finance, Economics, Theory of Economics
Cover of the book 供給:不可告人 by 蔡克, Hak Choi
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Author: 蔡克 ISBN: 1230002251547
Publisher: Hak Choi Publication: April 4, 2018
Imprint: Language: Chinese
Author: 蔡克
ISBN: 1230002251547
Publisher: Hak Choi
Publication: April 4, 2018
Imprint:
Language: Chinese

經濟學家一直把供需模型掛在嘴巴。如他們說有供給定律,即價格與數量的正比關係,但如何求得這關係呢?有人以為效用或無異曲線可以求得,但我証明他們大多數時間求得的關係是負的。或者,在什麼所得效果與替代效果的某一特定組合,可以有正的關係,但那就不是定律了(定律必須是什麼情況都成立)。效用無法導出供給定律,有人就直接用所得線做供給線,也有人直接用成本來做,也有人用垂直線做,或用下降的成本來做,或用一升一降的,或用逆轉的線,甚至無中生有。總之,供給線變得五花八門,但本書証明,就是沒有一條是正確的。

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經濟學家一直把供需模型掛在嘴巴。如他們說有供給定律,即價格與數量的正比關係,但如何求得這關係呢?有人以為效用或無異曲線可以求得,但我証明他們大多數時間求得的關係是負的。或者,在什麼所得效果與替代效果的某一特定組合,可以有正的關係,但那就不是定律了(定律必須是什麼情況都成立)。效用無法導出供給定律,有人就直接用所得線做供給線,也有人直接用成本來做,也有人用垂直線做,或用下降的成本來做,或用一升一降的,或用逆轉的線,甚至無中生有。總之,供給線變得五花八門,但本書証明,就是沒有一條是正確的。

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