http://cointelegraph.com/news/112462/finance-professor-david-yermack-argues-that-bitcoin-should-not-be-considered-as-money

There's a lot of basic financial data that suggests that, in terms of being a store of value for instance, Bitcoin is very volatile on a day to day price," argued Yermack.

The professor noted that Bitcoin was probably more volatile than any other financial assets, adding that the digital currency tented to fall almost 10% on a given day, which makes it much more volatile than any other currencies that are being traded on the markets around the world, as well as gold and shares of stock.