This week saw newly-appointed Saudi Energy Minister Prince Abdulaziz bin Salman thrust into the spotlight at the 12 September meeting of the Opec+ Joint Ministerial Monitoring Committee (JMMC) in Abu Dhabi. Serial overproducers Iraq and Nigeria made public commitments to boost compliance, but whether action follows is another question.

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In the end, the meeting passed swiftly at around two hours in total, and afterwards minsters were at pains to stress how convivial the gathering...