“As a currency I do worry a little bit when the underlying fluctuates tremendously. One of the values of a currency is some stability. Who will maintain value — can we have confidence in an unseen, unknown centre which will maintain the value of the currency or an algorithm which will maintain the value of the currency. If a currency is a target of speculation, as opposed to primarily a means of exchange, it does create some concerns for the user.”
-Dr. Rajan about Bitcoins & litecoins