AS THE developed-world economy tries to gain momentum, it faces a persistent headwind. The oil price remains stubbornly over $100 a barrel, acting like a tax on Western consumers. Some blame the high price on evil speculators—Barack Obama unveiled plans to increase penalties for market manipulation on April 17th. But there is a simpler explanation: that supply is inadequate to keep up with rising demand.
The concept of peak oil—the idea that global crude production may be at, or close to, its limit—is far from universally accepted. One leading asset manager talked recently of the world being “awash with energy” because of the exploitation of American shale gas. Nevertheless, oil is still the main fuel for cars and trucks. And crude output (as opposed to alternatives such as biofuels and liquids made from gas) has been flat since 2005.