Economist Thomas Piketty: Inequality 'becoming too extreme'
A new book on economics that highlights the gap between rich and poor has been rising in popularity.
Capital in the Twenty-First Century says that while inequality reduced in the 20th Century, it is now rising - a situation which the French author thinks is hugely dangerous.
Thomas Piketty told Newsnight's Jeremy Paxman that equality matters because "democratic institutions cannot work properly if inequity becomes too extreme".
01 May 2014