He predicted there would be large numbers of migrants, which would put "huge pressure" on public services.
In itself, it does not prove that migrants are a drag on public services as a whole.
The other fifth goes on public services, from health care to the police, and has already been squeezed.
He said the report aimed to ensure that every pound spent on public services was a pound well spent.
But it will also discover that most European countries spend a great deal more on public services than Britain.
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The results should enable the Conservatives to take a more critical look at the government's record on public services.
Ms Sturgeon went on to defend the Scottish government's record on public services.
Partly because of Labour's difficulty in showing that the money it has lavished on public services has been well spent.
Plans to go into business and earn income to spend on public services have been unveiled by Surrey County Council.
But to get there, Scotland would have to run regular, substantial surpluses, foregoing spending on public services in the meantime.
In Britain, for instance, a contingency fund to help cash-strapped local authorities facing pressure on public services has been scrapped.
Labour's narrative was once devastatingly clear: the revenues from a buoyant economy should correct the historic underspend on public services.
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It is important to remember that many people with special needs depend on public services to function to their highest potential.
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But set against such spending are the extra pressures on public services from these overseas students, including health, recreation and the police.
Green gestures, liberal noises on race and sexuality and a focus on public services and poverty all helped him to make progress.
Conservative Shadow Chancellor Oliver Letwin criticised the government's record on public services.
Undocumented youngsters lie at the intersection of three official priorities: to protect children, to discourage illegal immigration and to economise on public services.
Strains on public services can sorely test the patience of locals, especially when budget cuts are making it hard to maintain such services.
The speech featured strong criticism of the lack of data with which to tell what is being spent on public services and how effectively.
Those millions would otherwise be available to the governments to spend on public services, so it is a problem that has received considerable attention.
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Meanwhile, members of Mr Obama's cabinet have warned that allowing the cuts to go through would force them to scale back on public services.
Of the total rise in expenditure on public services in the three years ahead, a fifth goes to education and a third to health.
And, as acknowledged in the leaked paper from the finance ministry this week, an oil fund would require sacrifices in future spending on public services.
These higher taxes have funded record increases on public services, but Mr Brown has been less than straightforward about the fact that the spending spree is over.
The influx of Iraqis fleeing violence during the war has placed a strain on public services in Jordan, now hosting what the United Nations estimates are 750, 000 refugees.
The ability to sustain this higher spending on public services also depends critically upon the Treasury's ability to constrain the real growth in annually-managed expenditure to 1.2% a year.
But migrants as a whole, in the long term and counting the contribution of their children when they grow up and get jobs, are not a drain on public services.
Publishing its findings, the committee said the fact people were living longer offered benefits for many but also threatened a "series of crises" unless action was taken to mitigate the impact on public services.
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If he became Conservative leader, he could offer a safe pair of hands for voters to turn to if they tire of Tony Blair's tricksy ways and Labour's unfulfilled promises on public services.
If higher expenditure on public services comes to be seen as payday for public-sector workers, Labour will lose the reputation for prudent economic management which it struggled so hard to win in its early, parsimonious, years.
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