Click here to really a fascinating post on the history and usefulness of the Gini coefficient, which is the standard way to measure income inequality (hat tip - Graham Brownlow). There is a really good map in the post which allows you to click on a country and find out its current Gini score as calculated by the CIA.
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.