Money here exists in three forms- currency, money which is deposited in checking or savings accounts at banks or savings institutions, and investments.
Currency is made up of coins and bills or federal reserve notes.
These coins are usually made of copper or nickel or a combination of both. Different materials, such as steel have been used in the past. All of these coins are token coins. This means that the value of the coin is more than the value of the metal used in making the coin. Coins make up about nine percent of the currency in the United States today.