OPEC Secretary General Nigerian Mohammed Barkindo (R), the Chairman of the OPEC Board of Governors Algerian Mohamed Hamel (L) and the President of the Organisation of Petroleum Exporting Countries (OPEC) Mohammed bin Saleh al-Sada (C) attend a meeting of the Organization of the Petroleum Exporting Countries, OPEC, at the OPEC headquarters in Vienna, Austria on November 30, 2016. OPEC sought to defy expectations and finalise a deal reducing its oil output for the first time in eight years, in an effort to boost painfully low crude prices. / AFP / APA / HERBERT NEUBAUER / Austria OUT (Photo credit should read HERBERT NEUBAUER/AFP/Getty Images)
