Value of a currency on exchange is roughly equivalent to the size & value of the market of goods and services you can buy with it, over the amount of said currency in circulation, in comparison to the other currency.Mangod said:Unrelated to the robbery itself (thought it's still sad that people got robbed), but I have a question; how can a single Bitcoin be worth $691?
Bitcoin has a relatively small market by U.S. standards but an extremely limited number of currency to go around. The U.S. has a large market but a MASSIVE amount of currency going around compared to bitcoin.
As people have more money, they're willing and able to pay more for the same things. On the net, and all else being equal (no productivity increases, for example) people will have more money if said money is inserted into circulation. Since the size of the US monetary supply is so large relative to the size of the market that accepts USD for goods and services, the value of any one unit of it is small.
Conversely, for all those who buy and sell in bitcoin, one bitcoin is a significant chunk of that market.
No, bitcoin is a currency. It's not comparable to a commodity by any stretch of the imagination. The value of a commodity is intensely intertwined with its supply, not just its demand. Bitcoins supply is not volatile at all, ergo Bitcoin is not a commodity. This is why commodities based on agriculture shoot up in price during droughts, and why oil shoots up in price after oil spills.Raesvelg said:Think of Bitcoin less as a currency, and more as a commodity, like stocks, or gold. Currency values relative to other currencies are relatively stable, unless one of the issuing governments gets into serious economic trouble elects to print excessive amounts of currency to pay its bills.
Commodities are worth whatever people are willing to pay for them. Bitcoin is effectively an extremely volatile commodity, with major price swings over very short periods. A lot of the price ups and downs are actually driven by that aspect of it: there are many people who see it in the news, and view it as a way to make money quickly, much like similarly volatile stocks. And much like their counterparts in the stock market, a lot of those people are getting burned.
Bitcoin isn't stable because the size of the bitcoin market is expanding rapidly every day. Currencies issued by governments, conversely, don't see such rapid changes in the size of the markets where it is used. If everyone in the world started using USD to make daily purchases, the price of USD would shoot up far faster than bitcoin. This would not make it a commodity.