The next major advance came in 1982, when Sims put metal edges on his snowboard so it could be used in a wider variety of snow conditions. He went on to improve and expand the sport over the years, introducing new snowboarding styles, bindings and designs.
Commodity money is a form of money with an intrinsic value. Some of the best examples of commodity money are silver and gold coins. Currency(cash) or banknotes do not have intrinsic value and are virtually worthless in itself. It only has value because society views it as a unit of exchange. This type of currency is called fiat money.
Throughout most of history, most money has been commodity money, which is an item used for money that has intrinsic value. Gold, copper, and silver coins are common examples. One major problem with commodity money is that it's cumbersome to use for large purchases. Just think how many silver coins you may have to use to purchase a car or a house - you would literally need a treasure chest or more. Representative money solves this problem.