Piketty ends Capital in the Twenty-First Century with a call to arms - a call, in particular, for wealth taxes, global if possible, to restrain the growing power of inherited wealth. It's easy to be cynical about the prospects for anything of the kind. But surely Piketty's masterly diagnosis of where we are and where we're heading makes such a thing considerably more likely. So Capital in the Twenty-First Century is an extremely important book on all fronts. Piketty has transformed our economic discourse; we'll never talk about wealth and inequality the same way we used to.