Why is Bitcoin valuable?
This is perhaps the most important topic to address, as nothing else matters if Bitcoin has no value. What makes Bitcoin worth anything? Isn't it just "fake"? Isn't it just a made-up pretend virtual currency? Many say, "I can't hold it, I can't see it, and thus it's artificial and not worth my time." Let's challenge this understandable initial reaction. Let's demonstrate why Bitcoin is valuable, and very much worth one's time.
Financial privacy has long been symbolized by the notorious "Swiss bank account." Yet, anyone with a Swiss bank account has to trust that bank, and as we've seen in the last couple years, "bank privacy" even in Switzerland is a myth - banks there have been bending over for the US government and divulging customer information. So imagine having a private, numbered Swiss bank account, but without having to bother with the Swiss bank itself. That is Bitcoin. Instead of placing your trust in a regulated bank governed by fallible humans, Bitcoin enables you to place your trust in an unregulated cryptographic environment governed by infallible mathematics. 2+2 will always equal 4, no matter how many guns the government points at the equation.
Bitcoin is thus the only currency and money system in the world which has no counter-party risk to hold and to transfer. This is absolutely revolutionary and you should read the preceding sentence again. Gold advocates will point out that physical gold bullion has no counter-party risk, but that is only true for storage in your own home. Store it in a vault or bank and you have counter-party risk. And sending gold? You have to trust all sorts of people if you wish to transfer your gold somewhere else or spend it across distance.
Bitcoin means complete ownership of money both in storage and transfer. Nobody can prevent you from having it. Nobody can prevent you from spending it. Even if one's home is broken into, or even if the government issues a "confiscation order" (as they did with gold in 1933), one's Bitcoins are perfectly safe. Try fleeing a country with $1,000,000 in bullion without the government knowing about it. Easier said than done. With Bitcoin, it's almost easier done than said - you could put $1,000,000 of Bitcoin on a USB drive, or even write the private key on a piece of paper, or just email the wallet file to yourself to be retrieved outside the country.
Starting to see the value? Never in the history of the world has an individual had this ability. It is unprecedented.
No really, WHY is Bitcoin valuable???
At this point, skeptics should say, "okay fine, you can store and spend Bitcoins without interference, but what gives them initial value? Why do they have a price?" It's a very good question, and even expert economists have struggled with the answer.
But really, the answer is simple. Bitcoins have value because A) they are useful and B) they are scarce. Combine those two attributes in any asset and you will discover it has a price. The moment the first Bitcoin was traded to someone in exchange for something else, an exchange rate (market price) was established. Subsequent exchangers agreed or disagreed with that rate, and made further trades accordingly. Bitcoin thus spontaneously developed a price, as do all things in an open market if they are sufficiently useful and sufficiently scarce.
Let's look at value a little further, because it's a contentious issue with Bitcoin. There are many (including Paul Krugman) who believe Bitcoin isn't worth anything and is no more than a speculative bubble fad.
I wouldn't expect Krugman to "get it," but wiser/real economists need only observe metals to start understanding why Bitcoins have value. After all, any strong advocate of gold or silver as money should hopefully understand why these metals should be money. The answer is that these metals tend to be chosen in an open marketplace as money, because their specific properties make them useful as a means of exchange. It is the properties of gold and silver—unique to these metals—which make them excellent money. They are scarce, fungible, uniform, transportable, have a high value-to-weight ratio, are easily identifiable, are highly durable, and their supplies are relatively steady and predictable. Contrast other goods like chickens, or seashells, or sand, and you discover that none of them are as good on the above attributes as precious metals. Chickens can't well be cut in half or recombined, seashells are not uniform, and sand is too plentiful to be used as money. Why not other metals... why don't we use iron as money? It's not scarce enough - you'd need carts of it at the store to go shopping.
As any Austrian economist can tell you, money is merely that commodity in an open market which best satisfies the properties necessary for useful exchange. Gold and silver take the cake every time a violent government doesn't get in the way... or at least, this is true historically. But, this doesn't mean that gold and silver are "perfect, infallible money." Indeed, there are practical problems. One can't easily divide and combine silver coins to make change. One can't easily send large values of gold across distance without hiring security and waiting for transport. One must pay storage fees, or risk theft at home. And, while difficult, it is possible to make fake gold and silver ingots and pass them off in trade as real.
So then it follows that if gold and silver are not perfect money (though admittedly the best we've had), perhaps mankind could discover or invent something that was even better. This is the Bitcoin experiment - the question of whether Bitcoin, with its specific attributes, is an even better form of money than what the marketplace currently enjoys (or in the case of state fiat, is forced to use). If the Austrians are right, and a marketplace tends to chose the medium of exchange which best works as money, and Bitcoin's specific attributes make it excellent money, then perhaps the marketplace will, over time, increasingly use it for such.
The answer so far, is yes. Bitcoin is finding more and more niches for early adoption, which further supports its market price, providing confidence to holders that it will retain value, and this further lends Bitcoin to be used for still more purposes. It's an organic and messy process, full of trial and error, potholes, brilliant innovations and terrible failures. But that's what an open marketplace is, no? Every day a more resilient economy is being built, and not at the point of a gun, but voluntarily - not by decree of Bernanke, but by spontaneous, self-interested private order.
Many have made the argument that "nothing backs Bitcoin." And this is true. Bitcoin cannot be redeemed for any fixed value, nor is it tied to any existing currency or commodity. But, neither is gold. Gold is not backed by anything - it is valuable because it's useful and scarce. Cars are not backed by anything, they are merely useful as cars and thus have value. Food is not backed, nor are computers. All these goods have value in proportion to their usefulness and scarcity, and one merely needs to see the usefulness of Bitcoin to understand why, without backing from any government nor corporation, without being tied to any fiat currency or existing commodity, it commands a price on the market and rightly so.
http://evoorhees.blogspot.com/2012/04/bitcoin-libertarian-introduction.html