Vox have just released an e-book entitled Secular Stagnation: Facts, Causes and Cures. The list of contributors is impressive - Larry Summers, Paul Krugman, Barry Eichengreen, Edward Glaesar, Nick Crafts, Joel Mokyr are just some of the authors. The book's summary is here. The workable definition of secular stagnation which emerges from the book is "that negative real interest rates are needed to equate saving and investment with full employment." The main concern of the authors is "that secular stagnation makes it harder to achieve full employment with low inflation and a zero lower bound on policy interest rates."
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.