We have a structural gap between the money going out and the money coming in.

WHITEHOUSE: Job Creation and Economic Growth

Another structural problem in the labour market is the gap between the public and private sector.

BBC: Unemployment set to rise in 2012, suggests CIPD

The huge gap between job openings and jobless numbers suggests something insidious and possibly structural: a talent crunch.

FORBES: Talent Crunch Threatens U.S. Recovery. Software To Rescue

In Europe, economists at the European Commission, the EU's executive arm, produce official estimates of the gap between actual and potential GDP that are crucial for calculating the structural deficit.

WSJ: Wonk Wars: How Big Are EU Deficits?