Bitcoin? Currency?financial Product?

1.a stable storage.
2.a medium of transaction
3.a unit of accounting
because if the price of bitcoin changes so fast that it can not be a unit of accounting. Infact,it is more like a gold, a financial product.

Economic professor's view

From the Harvard University Public Policy and economic development professor Chris Robert, the former Federal Trade Commission economist Robert McMilla and the Economist magazine senior editor Matthew bishop bit currency available: because hot and quantified by wide era and the arrival of the global economic downturn, bitcoin is more likely to be valued by speculation, the government may take intervention measures and supply quantity is limited and known, so it will be as a kind of financial products exist for a long time, rather than a currency.
From the viewpoint of Columbia Business School professor Brett Gordon and University of Virginia Darden School Professor Peter Rodriguez, bitcoin problem of the key lies in whether it can survive in the future, and any mysterious currency lift will have the nature of the bitcoin, born through shrinkage, anonymity. Combined with the above point of view, and in my opinion, bitcoin is a premature to launch products (a premature), now and not Nakamoto prediction of human progress to an almost constant development stage, ignoring the national, the power of the black market, so bitcoin by financial product development to a currency is very difficult.

bitcoin: true social:
policy: https://zh.wikipedia.org/wiki/%E6%AF%94%E7%89%B9%E5%B8%81