On 28 April, the UAE, which produces about 4% of the world’s oil, thanked the Organisation of the Petroleum Exporting Countries (Opec) for “five decades of cooperation”, then resigned.Opec is an intergovernmental group that imposes production quotas on members to keep oil prices “fair and stable”, it says; economists see it as a classic example of a cartel, a group that collaborates to reduce competition and raise prices.

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