David Yager: Why ‘the world should be worried’ about oil supplies

Saudi Arabia has reminded us again of the power of the world’s largest oil producer. Through Saudi Aramco, one country with only 35 million people controls 11 per cent of global supply.

Saudi Arabia can influence global oil prices simply by adjusting output. It has demonstrated this many times. The Saudis also control OPEC, but don’t advertise it.