A looming supply glut is weighing on giants from Exxon to Shell
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Behind the scenes at The Economist
Exxon and Chevron have benefited less than their European rivals
Meet the corporate gamblers who never waste a good energy crisis
As stocks dwindle, further price rises are inevitable
Alternatives to Gulf supplies are scare
The great commodity-market mystery is deepening
Although many of their investments have a commercial logic, the result looks increasingly unwieldy
