It is thought the Dreamliner's claim to fuel efficiency will be an advantage as oil prices continue to soar.

BBC: Dreamliner to fly by end of 2008

The basic claim is that the government should change endowments with transfers, but allocative efficiency is maximized by letting individuals choose their utility maximizing consumption bundle.

FORBES: Paternalism and Welfare

According to the National Audit Office only a quarter of the claimed savings were fairly represented while the second efficiency programme launched just last year is "cutting services to claim efficiencies" - and has "acute" measurement problems.

BBC: In full: Cameron's economy speech