"It seems safe to say that Capital in the Twenty-First Century, the magnum opus of the French economist Thomas Piketty, will be the most important economics book of the year—and maybe of the decade. Piketty, arguably the world’s leading expert on income and wealth inequality, does more than document the growing concentration of income in the hands of a small economic elite. He also makes a powerful case that we’re on the way back to ‘patrimonial capitalism,’ in which the commanding heights of the economy are dominated not just by wealth, but also by inherited wealth, in which birth matters more than effort and talent,” wrote Paul Krugman in The New York Times. Krugman and his fellow Nobel laureate Joseph Stiglitz (author of The Great Divide) join Piketty to discuss the genius of economics. Moderated by MSNBC's Alex Wagner.