As Russ indicated, money (more precisely paper currency) is also subject to the rule (or law) of supply and demand. It's value must be represented or supported by something of value, such as a material commodity like gold, silver, or diamonds, or some other natural resource, such as trees (lumber), minerals, petroleum, etc.
On the other hand, take a small country or state, like the Principality of Monaco, or Lichtenstein. They have develop their value in providing services like banking, entertainment, gambling, etc, i.e. something that other people (outsiders) demand. Their money/currency is supported by foreign exchange.
If the money was made of gold or silver, it would have some intrinsic value.