But the company expects to extend the hours as demand rises.

Even the experts admit that as demand rises, this will become even more of a problem.

Private money becomes particularly tempting as demand rises and public support falls.

And conversely, as prices for goods or services fall, marginal demand rises.

As demand rises, he says, "the airlines aren't adding capacity, they're cutting back or staying about even."

But as demand rises, new North American supplies are getting more expensive to drill.

The dispatcher is running all his generators, and still watching demand rise.

Vast amounts of the materials could become accessible if demand rises.

Something like that happened a few times last summer, and it could happen more often as demand rises.

And until demand rises, the company won't be able to raise its prices much, either.