This is the reason for the volatility. Since bitcoins are not backed up by anything, unlike in fiat currency where it is backed by gold and/or the government that issued the currency, this results to bitcoins being valued by the users themselves. That is why we see a whole lot of volatility here. Maybe in the future when there are more people using it then we could see some stability.
Wake up now, no fiat currency out there is still backed by gold, it used to be back in the days, but not anymore. As a matter of fact, government issued currencies are backed by nothingness, that is the reason, they print enormous quantities at will and a chief reason inflation is already double digits in most countries.
Bitcoin supply for now is capped at 21 million coins and that cannot be faked, transactions are transparent and a holder has the final say what becomes of their money unlike the manipulations common with fiat currencies.
LOL, the term "fiat currency" specifically means money created by government decree, with no explicit backing other than the rule of law and violence by that government. For example, gold and silver backing of USD ended 100 years ago.
I'm surprised that nobody has pointed out that Bitcoin price can easily be manipulated by EXCHANGES. In fact, it has been proven that Mt. Gox increased the BTC/fiat exchange rate by about 10x, before the whole thing came crashing down. Many may not realize that exchange transactions are not recorded on the blockchain, only with withdrawals and deposits go to the bank and blockchain records. An exchange can sell you "bitcoin" or "dollars" all day even if there is nothing to back it. An exchange can "buy bitcoin" from itself all day long as well. Naturally this causes increases in the bitcoin price. Of course exchanges and traders can arbitrage each other, but they can also work together and collude to drive the price upward (or downward). Finally, exchanges can "front-run" any trade - here they simply buy or sell milliseconds before you do, taking a small fraction from each transaction (on top of any fees they charge). It is known in the fiat financial world that Goldman Sachs and other market-makers front-run every day 24x7, using high frequency trading datacenters.
None of this price-changing activity by exchanges would be illegal - the Bitcoin space is still largely unregulated. Mark Karpeles went to jail for one year for "fraud", but that was simply for misrepresentation and lying. Given this environment, I don't see why and exchange
wouldn't engage in at least some price manipulation... likely they would be a bit smarter than Karpeles was...