| Also unheard-of was a cartel cornering a commodity such as crude oil, as long as the medium of exchange was gold. |
| Silver has also been an important medium of exchange since very early times. |
| Given a medium of exchange, people can trade even if their wants and needs don't directly coincide. |
| Accordingly, money is brought forth into society to be used as a medium of exchange to facilitate the trade of goods of all kinds. |
| If a certain type of good is employed as a medium of exchange, one speaks of money. |
| Because it was valuable, wampum became a medium of exchange not only between Indians and traders but also among the colonists. |
