Commodity money 2

One interesting example of commodity money is the huge limestone coins from the MicronesianYap, quarried with great peril from a source several hundred miles away. The value of the coin was determined by its size — the largest of which could range from nine to twelve feet in diameter and weigh several tons. Displaying a large coin, often outside one's home, was a considerable status symbol and source of prestige in that society.

(Owing to the great inconvenience, islanders would often trade only promises of ownership of an individual coin instead of actually moving it. In some cases, coins which had been lost at sea were still used for exchange in this way. These agreements could be thought of as a kind of representative money, described below.) island of

Once a commodity becomes used as money, it takes on a value that is often different from its intrinsic worth or usefulness. Having the property of money adds an extra use to the commodity, and so increases its value.

This extra use is a convention of society, and the scope of its use as money within the society affects the value of the monetary commodity. So although commodity money is real, it should not be seen as having a fixed value in absolute terms.

To a large extent its value is still socially determined. A prime example is gold, which has been valued differently by many different societies, but perhaps valued most by those who used it as money. Fluctuations in the value of commodity money can be strongly influenced by supply and demand, whether current or predicted (if a local gold mine is about to run out of ore, the relative market value of gold may go up in anticipation of a shortage).

Money can be anything which the trading parties agree has transferable value, but the usability of a particular sort of money varies widely. Desirable features of a good basis for money include being able to be stored for long periods of time, dense so it can be carried about easily, and difficult to find on its own so it is actually worth something.

Metals like gold and silver have been used as commodity money for thousands of years, being in the form of metal dust, nuggets, rings, bracelets and assorted pieces. Eventually the Lydians began coining gold and silver around 560 BC.

Gold and silver are both quite soft metals, and coins minted from the pure metals suffer from wear or deformation in daily use. Fortunately these metals are also easily alloyed with a less expensive metal, frequently copper, to improve durability of the resulting coins. Typically alloys of coinage metals, such as sterling silver or 22 carat (92%) gold, are used to make coins more durable. These are alloys of 90% or more precious metal, for alloys of less than 90% do not improve hardness or durability much, and so are typically considered to be liable to fall into monetary debasement.