Oil tankers dropped anchor off the coast of Fujairah in the Gulf of Oman Photo: Alamy A secretive group of the world’s most powerful oil ministers will soon gather in Vienna to take arguably one of the most important decisions that could affect the still fragile world economy: whether to cut production of crude to defend prices at $100 per barrel, or keep open the spigots as winter looms among the biggest energy-consuming nations? A sudden slump in the price of crude has exposed deep divisions within the Organisation of Petroleum Exporting Countries (Opec) ahead of its final scheduled meeting of the year next month to decide on how much oil to pump. Some members, led by Iran, have called for immediate action to stem the drop in oil prices, while the Arab sheikhdoms of the Gulf have so far argued that it could be another three months before […]