西南学院大学経済学部 経済数学II 講義ノート 講義ページ: http://courses.wshito.com/

1. shito@seinan-gu.ac.jp
2020 4 30
•
•
•
1
P.44 3
:::::::::::::::::::::::::::::::::::
⇓
2 —
(1)
• 1
• P Qd Qs
1

2. www.seinan-gu.ac.jp/˜shito 2020 4 30 14:48
Qd = 10 − 2P
Qs = −8 + 4P
P
Q
Qd = a − bP
Qs = −c + dP
P
Q
Qd =
Qs =
Qd = Qs
⇓
Q∗
d = Q∗
(a, b, c, d)
Q∗
s = Q∗
(a, b, c, d)
P∗
= P∗
(a, b, c, d)



Qd = Qs Q∗
() !
II 2

3. www.seinan-gu.ac.jp/˜shito 2020 4 30 14:48
(2)
(a)
(b)
(1) pp.41–49
(2) 3.2 1 3
3 —
4
2 1 Qd Qs
(1) 2 2 2
1



Qd1 = a0 + a1P1 + a2P2
Qs1 = b0 + b1P1 + b2P2
Qd1 = Qs1
2



Qd2 = α0 + α1P1 + α2P2
Qs2 = β0 + β1P1 + β2P2
Qd2 = Qs2
II 3

4. www.seinan-gu.ac.jp/˜shito 2020 4 30 14:48
1



Qd1 = a10 + a11P1 + a12P2
Qs1 = b10 + b11P1 + b12P2
Qd1 = Qs1
2



Qd2 = a20 + a21P1 + a22P2
Qs2 = b20 + b21P1 + b22P2
Qd2 = Qs2
⇓
Q∗
di = Q∗
si = Q∗
i (a10, a11, a12, b10, b11, b12, a20, a21, a22, b20, b21, b22)
P∗
i = P∗
i (a10, a11, a12, b10, b11, b12, a20, a21, a22, b20, b21, b22)
where i = 1, 2.
Q∗
i P∗
i
II 4

5. www.seinan-gu.ac.jp/˜shito 2020 4 30 14:48
(2) n n n
Quiz
Qdi =
Qsi =
where i = 1, 2, · · · , n.
⇓
II 5

6. www.seinan-gu.ac.jp/˜shito 2020 4 30 14:48
(3)
=
⇑
2
(a)
1
(b)
5y = 4 + 2x
15y − 1 = 11 + 6x
=⇒
=⇒
• pp.55–64
• p.4 2
• 3.5 45
II 6