salt, fish, leaves, many other items were used as "money" at some point in history.
a quick google puts this convo to rest:
http://www.pbs.org/wgbh/nova/moolah/history.html
The History of Money
In the Beginning: Barter
Barter is the exchange of resources or services for mutual advantage, and may date back to the beginning of humankind. Some would even argue that it's not purely a human activity; plants and animals have been bartering -- in symbiotic relationships -- for millions of years. In any case, barter among humans certainly pre-dates the use of money. Today individuals, organizations, and governments still use, and often prefer, barter as a form of exchange of goods and services.
9,000 -- 6,000 BC: Cattle
Cattle, which include anything from cows, to sheep, to camels, are the first and oldest form of money. With the advent of agriculture came the use of grain and other vegetable or plant products as a standard form of barter in many cultures.
1,200 BC: Cowrie Shells
The first use of cowries, the shell of a mollusc that was widely available in the shallow waters of the Pacific and Indian Oceans, was in China. Historically, many societies have used cowries as money, and even as recently as the middle of this century, cowries have been used in some parts of Africa. The cowrie is the most widely and longest used currency in history.
1,000 BC: First Metal Money and Coins
Bronze and Copper cowrie imitations were manufactured by China at the end of the Stone Age and could be considered some of the earliest forms of metal coins. Metal tool money, such as knife and spade monies, was also first used in China. These early metal monies developed into primitive versions of round coins. Chinese coins were made out of base metals, often containing holes so they could be put together like a chain.
500 BC: Modern Coinage
Outside of China, the first coins developed out of lumps of silver. They soon took the familar round form of today, and were stamped with various gods and emperors to mark their authenticity. These early coins first appeared in Lydia, which is part of present-day Turkey, but the techniques were quickly copied and further refined by the Greek, Persian, Macedonian, and later the Roman empires. Unlike Chinese coins which depended on base metals, these new coins were made from precious metals such as silver, bronze, and gold, which had more inherent value.
118 BC: Leather Money
Leather money was used in China in the form of one-foot-square pieces of white deerskin with colorful borders. This could be considered the first documented type of banknote.
800 - 900 AD: The Nose
The phrase "To pay through the nose" comes from Danes in Ireland, who slit the noses of those who were remiss in paying the Danish poll tax.
806 AD: Paper Currency
The first paper banknotes appeared in China. In all, China experienced over 500 years of early paper money, spanning from the ninth through the fifteenth century. Over this period, paper notes grew in production to the point that their value rapidly depreciated and inflation soared. Then beginning in 1455, the use of paper money in China disappeared for several hundred years. This was still many years before paper currency would reappear in Europe, and three centuries before it was considered common.
1500s: Potlach
"Potlach" comes from a Chinook Indian custom that existed in many North American Indian cultures. It is a ceremony where not only were gifts exchanged, but dances, feasts, and other public rituals were performed. In some instances potlach was a form of initiation into secret tribal societies. Because the exchange of gifts was so important in establishing a leader's social rank, potlach often spiralled out of control as the gifts became progressively more lavish and tribes put on larger and grander feasts and celebrations in an attempt to out-do each other.
1535: Wampum
The earliest known use of wampum, which are strings of beads made from clam shells, was by North American Indians in 1535. Most likely, this monetary medium existed well before this date. The Indian word "wampum" means white, which was the color of the beads.
1816: The Gold Standard
Gold was officially made the standard of value in England in 1816. At this time, guidelines were made to allow for a non-inflationary production of standard banknotes which represented a certain amount of gold. Banknotes had been used in England and Europe for several hundred years before this time, but their worth had never been tied directly to gold. In the United States, the Gold Standard Act was officialy enacted in 1900, which helped lead to the establishment of a central bank.
1930: End of the Gold Standard
The massive Depression of the 1930's, felt worldwide, marked the beginning of the end of the gold standard. In the United States, the gold standard was revised and the price of gold was devalued. This was the first step in ending the relationship altogether. The British and international gold standards soon ended as well, and the complexities of international monetary regulation began.
The Present:
Today, currency continues to change and develop, as evidenced by the new $100 US Ben Franklin bill.
The Future: Electronic Money
Digital cash in the form of bits and bytes will most likely become an important new currency of the future.
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