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<p>Diketahui =&nbsp;</p><p>Qd = -4P + 28</p><p>Qs = &nbsp;2P + 20</p><p>&nbsp; s &nbsp;= 10</p><p>Ditanya =&nbsp;</p><p>1. Harga keseimbangan pasar ?&nbsp;</p><p>2. Harga keseimbangan pasar dengan subsidi?&nbsp;</p><p>3. Kurva</p><p>Penyelesaian =</p><p>1. Harga keseimbangan&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Qd = Qs</p><p>&nbsp; -4P - 2P = 20 - 28</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; -6P = -8</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;P = -8 : -6</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;P = 1,33</p><p>2. Harga keseimbangan debgan subsidi</p><p>( i ). Ubah fungsi penawaran menjadi fungsi harga (Ps) lalu kurangi dengan bedar subsidi (s = 10) :</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Qs = 2P + 10</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;-2P = -Qs + 20</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Ps = 0,5 Q - 10</p><p>( ii ). Fungsi penawaran setelah subsidi (Pss) :</p><p>&nbsp; &nbsp; &nbsp; &nbsp; Pss = Ps + 20</p><p>&nbsp; &nbsp; &nbsp; &nbsp; Qss = 2P + 40</p><p>( iii ). Ubah kembali ke bentuk fungsi jumlah setelah subsidi (Qss) :</p><p>&nbsp; &nbsp; &nbsp; 0,5 Q = P + 20</p><p>&nbsp; &nbsp; &nbsp; &nbsp; Qss = 2P + 40</p><p>( iv ). Mencari harga keseimbangan baru dengan Qd = Qss :</p><p>&nbsp;-4P + 28 = 2P + 40&nbsp;</p><p>&nbsp;-4P - 2P = 40 - 28&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;-6P = 12&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; P' = -2</p><p>3. Kurva</p><p>Karena fokusnya hanya di harga, kita cukup mencari titik potong pada sumbu P (saat nilai Q = 0) :&nbsp;</p><p>• Kurva Permintaan (Qd = -4P + 28) memotong sumbu harga di P</p><p>• Kurva Penawaran Lama (Qs = 2P + 20) memotong sumbu harga di P = -10</p><p>• Kurva Penawaran Baru (Qss = 2P + 40) memotong sumbu harga di P = -20</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p>