Exxon Mobil is the world's most valu-ble listed company, with a market capitalisation of $412 billion. But if you compare oil companies by how much they have left in the ground, the American giant ranks a lowly fourteenth. All 13 of the oil firms that outshadow it are national oil companies (NOCS): partially or wholly state-owned firms through which governments retain the profits from oil production. Because these national champions control as much as 90% of the world's oil and gas, they can do far more than the likes of Exxon to assuage the current worries about supply and to influence the accompanying record prices. But like most state-owned firms, they are prone to over-staffing, underinvestment, political interference and corruption.
展开▼
