Menurut kelangkaannya, udara yang kita hirup setiap hari termasuk barang ekonomi. Barang ekonomi adalah barang yang jumlahnya terbatas dan untuk memperolehnya diperlukan pengorbanan. Udara sangat penting bagi kehidupan manusia. Udara digunakan untuk bernapas, yang merupakan proses penting untuk memasukkan oksigen ke dalam tubuh dan mengeluarkan karbon dioksida. Tanpa udara, manusia…
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