Initially it is difficult see what President Donald Trump and Usman Ahsan, a taxi driver in Islamabad, the capital of Pakistan, have in common.
One is the leader of the US, with an estimated personal fortune of $3.1bn (£2.4bn), the other is struggling to support his wife and eight-month-old daughter.
Yet both are this week hoping that the Opec oil producers' cartel doesn't decide to cut production in an attempt to increase global crude prices.
Representatives of Opec's current 15 member states meet at its headquarters in Vienna, Austria on Thursday, 6 December, for their latest biannual meeting, where they will set production levels for the next six months.
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