Carl Icahn, the famous activist investor, has written an open letter to Apple's Tim Cook encouraging him to increase share buybacks and return cash to shareholders. The full text of the letter is available here. Icahn believes that the market is undervaluing Apple's future growth potential - he seems very excited by the iPhone 6. Given Apple's huge cash pile, it makes sense for it to repurchase shares which are significantly undervalued. An FT Lex video on the Icahn letter is below.
According to Robert Shiller , speaking at Davos, Bitcoin is a perfect example of a bubble - story here . Shiller sees Bitcoin as a backwards step in the evolution of money. George Selgin , a free banker, takes an opposing view - click here . Although he doesn't believe that Bitcoin is money, he sees its development as a fascinating turn in the evolution of money. In particular, he lauds the fact that Bitcoin production is constrained and cannot be infinite. There is a short video below where Bitcoin explain how it works.