New submitter rvw sends word that Bill Gates has posted a review of Capital in the Twenty-First Century , an acclaimed book by economist Thomas Piketty about how income equality is a necessary result of unchecked capitalism . Gates, one of the most successful capitalists of our time, agrees with Piketty's most important conclusions. That said, he also finds parts of the book to be flawed and incomplete, but says Piketty has started vital debate on these issues. Gates writes,