For those (like me) who see Bitcoin as a viable form of money, these are reasonable arguments about the potential of virtual currencies which have no material backing versus material currencies which can be traded virtually.
http://www.mises.org/daily/6399/The-Moneyness-of-BitcoinsNikolay Gertchev said:First, at any given moment, the level of technological development is not uniform for all individuals within the same (national) economy. While some have access to the latest technology in a given field of activity, others prefer to stick to older versions. This is definitely due to the cost of replacing existing capital goods, but also to individual preferences, and sometimes to personal wealth. Consequently, bitcoins could become money only at the point when the technology that embodies them becomes commonly used. We are not there yet.
Second, an economy in which the medium of exchange is dependent so much upon the widespread use of a specific technology would be extremely vulnerable. Technologies are not given; they are the result of individual choices with respect to capital accumulation and allocation that must be made time and again, and are subject to reversal. Then, if the medium-of-exchange-linked technology is abandoned, because for instance no sufficient savings are available any longer, the economy will have to find another medium of exchange. This transition phase might then involve significant disruptions in the structure of production. A technology-linked medium of exchange does not provide enough flexibility to economic relations and might be viewed as complicating, rather than facilitating, some actions, such as shifting from one technology to another. This is a significant drawback of any virtual currency.
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In conclusion, virtual monies, of which bitcoins seem to be the most perfected specimen up to date, do not allow acting individuals to manage the uncertainty of the future as well as material monies do. They could serve to intermediate exchanges among those who invest in the technology that creates them, stores them, and transfers them. Nevertheless, they could never achieve that degree of universality and flexibility that material monies carry with them by nature. Thus, on the free market, commodity monies, and presumably gold and silver, still have a great comparative advantage.