The costs of the change rise steeply the shorter the time allowed.

ECONOMIST: The euro: Coining it | The

In theory, however, the undoubted value of these natural treasures should be reflected in their price, which should rise steeply as they become more scarce.

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But at successful firms wages rise steeply and schedules are demanding.

ECONOMIST: Women in the workforce

Dr. GERBER: The images are so gorgeous, and the temptation to look at the heart arteries is so great, that we expect the use of cardiac CT to rise fairly steeply.

NPR: Study: Heart CT Scans May Pose Risk

In rural areas the dependency ratio will rise far more steeply than in cities as young people move out and the elderly stay behind.

ECONOMIST: The consequences of an ageing population

However, Richard George, energy campaigner for Greenpeace, thinks the DfT underestimates how steeply the cost of flying could rise in the future.

BBC: The great London airport debate