Let's be clear that Thomas Piketty's book has been thoroughly refuted, not in some minor way, but Thomas claimed that all he did was objectively looked at the data, and that the conclusion simply showed itself. Unfortunately he cherry picked data, and fabricated bits of history to make it fit his claim. The following paper does a great job of completely dismantling it.

http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2543012

Not to mention that most people haven't even read past the first few pages of the book, and yet they quote it.

http://www.telegraph.co.uk/finance/economics/10951407/Has-an...