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Contoh Soal dan Jawaban Keseimbangan Harga Pasar Sebelum dan Sesudah Pajak & Subsidi

Berikut ini adalah soal beserta jawaban tentang keseimbangan harga sebelum dan sesudah pajak dan subsidi.
  • Keseimbangan Harga sebelum & Sesudah Pajak
Diketahui:
Fungsi permintaan P= 15-Q
Fungsi penawaran P= 3+0,5Q
Dikenakan pajak = 9/unit

Ditanya: Berapa harga keseimbangan sebelum dan sesudah pajak?
Jawab:
-Mencari Keseimbangan pasar
Qd=Qs
15-Q=3+0,5Q
15-3=Q+0,5Q
12=1,5Q
12/1,5=Q
8=Q
Mencari P
P=15-Q
P=15-8
P=7
-Mencari Keseimbangan harga sesudah pajak
Fungsi penawaran dengan pajak P=3+0,5Q+9
P=12+0,5Q
Sedang fungsi permintaan tetap P=15-Q
Qd=Qs
15-Q=12+0,5Q
15-12=Q+0,5Q
3=1,5Q
3/1,5=Q
2=Q
Mencari P
P=15-Q
P=15-2
P=13
Jadi titik keseimbangan harga pasar setelah pajak adalah Q=2, P=13
  • Keseimbangan Harga sebelum & Sesudah Subsidi
Diketahui:Fungsi permintaan Qd=40-2P
Fungsi penawaran P=Q+5 (diubah menjadi Q=P-5) 
Diberikan Subsidi Rp. 2/unit

Ditanya: Berapa harga keseimbangan sebelum dan sesudah subsidi?
Jawab:
-Mencari Keseimbangan pasar
 Qd=Qs
40-2P=P-5
45=3P
45/3=P
15=P
 Mencari Q
Q=40-2P
Q=40-2(15)
Q=40-30
Q=10
-Mencari Keseimbangan harga sesudah subsidi
Fungsi penawaran dengan subsidi Q=P-5
Q=P-5-2
Q=P-3
Sedang fungsi permintaan tetap Qd=40-2P
Qd=Qs
40-2P=P-3
43=3P
43/3=P
14,33=P
Mencari Q
Q=40-2P
Q=40-2(14,33)
Q=40-28,66
Q=11,34

Jadi titik keseimbangan harga pasar setelah subsidi adalah Q=11,34, P=14,33







-THANK YOU!-

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