In Economics, a good is something that can satisfy our wants.
經濟學上，物品指任何能滿足慾望的東西。
Economic good is a good that its quantity available is insufficient to satisfy all our wants to it. Therefore, it is also called scarce good.
經濟物品的數量不足以滿足人們對它的所有慾望。因此，經濟物品亦被稱為稀少物品。
People preferred to have more economic good. Therefore, they are willing to sacrifice to obtain more economic good.
人們想要更多經濟物品，因此願意為了獲得經濟物品而付出。
Free goods 免費物品
Free good is a good that its quantity available is sufficient to satisfy all our wants to it.
免費物品的數量足以滿足人們對它的所有慾望。
No one is willing to pay for obtaining more free good.
免費物品的數量足以滿足所有對它的慾望。人們不會願意為了獲得更多免費物品而付出。