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Jeremy Corbyn, leader of the U.K. opposition Labour Party, right, applauds John McDonnell, finance spokesman of the U.K. opposition Labour Party, left, after McDonnell delivered his speech at the party's annual conference in Brighton, U.K., on Monday, Sept. 28, 2015. Corbyn recruited Nobel Prize-winning economist Joseph Stiglitz and wealth and inequality expert Thomas Piketty to advise his party as he seeks to regain credibility for policies attacked by many academics as potentially disastrous. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Jeremy Corbyn, leader of the U.K. opposition Labour Party, right, applauds John McDonnell, finance spokesman of the U.K. opposition Labour Party, left, after McDonnell delivered his speech at the party's annual conference in Brighton, U.K., on Monday, Sept. 28, 2015. Corbyn recruited Nobel Prize-winning economist Joseph Stiglitz and wealth and inequality expert Thomas Piketty to advise his party as he seeks to regain credibility for policies attacked by many academics as potentially disastrous. Photographer: Chris Ratcliffe/Bloomberg via Getty Images