Those refineries, in turn, use up a lot more oil, pushing up its price too.

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But instead of waiting, Valero gets those refineries now.

FORBES

The sorts of computer systems it enters are those that control critical infrastructures like power plants, refineries and other industrial targets.

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But to make the most of it, the world needs more refineries of a certain design, and those do not spring up overnight.

ECONOMIST: Oil prices

For the oil companies know more about what people want from the refineries, what has to be fed into them to get those desired products, than the politicians and bureaucrats do.

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When a hurricane comes, count on large-cap investors to snap up stocks of not only home improvement companies, but also discount retailers (everyone's running for flashlights and other supplies and will be replacing losses from flood damage), home builders (all those houses need to be rebuilt) and oil companies (damage to refineries down in the Gulf sparks supply worries and kicks up prices).

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Oil refineries use hydrogen to strip sulfur from sour crude supplies, especially those from Mexico and Venezuela, and to meet stringent clean-fuel regulations.

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The angry hauliers and farmers who, in 2000, blockaded refineries in protest at the cost of fuel were more successful than those ranks of decorous rustics.

ECONOMIST: Bagehot