"We've got two policies, the first in terms of a national system of road pricing is that we have a debate ahead of a decision which lies some years away, " Mr Alexander said.

BBC: NEWS | UK | UK Politics | PM denies road toll 'stealth tax'

And a clear outcome we don't have in place at this point is the ability to compare two different policies that might achieve the same result - and let's just for the sake of argument say reducing the amount of drug dealing in a specific neighborhood - two different approaches that police might use to that particular problem.

NPR: Shooting Strains Police-Community Ties in NYC

And I've just been around long enough -- and you have too, Mara -- to know that we have recent examples of how these two policy positions play out and what results economically from the implementation of those policies.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,