The Windows Vista operating system is more compartmentalised, so bits can easily be upgraded.

ECONOMIST: Microsoft's latest upgrades should make PC users happier

As agencies have broadened their services, they have become compartmentalised into separate profit centres.

ECONOMIST: Advertising: Battle of the brand | The

It is unlikely that both propositions can be correct: the effects of powerful economic forces are not usually compartmentalised.

ECONOMIST: Crime and punishment