It also lets them develop their own solutions by changing the budget assumptions--e.g.
The Chancellor uses the lower end of that forecast for his budget assumptions and has insisted recently that they will be met.
Every year we try to do an honest, reasonable, conservative forecast to make sure that we are basing our budget assumptions on the best possible forecast that we can.
But it said it was still concerned that future budget assumptions were "over-optimistic" and that risks - such as the cost of bringing back equipment from Afghanistan - had not been fully factored into calculations.
While Scotland's public spending levels at present would require all of the oil revenues it can expect from oil, and still leaves a significant government deficit, there is a warning that an independent Scottish government should make cautious budget assumptions about oil revenues when they are so volatile.
Yet the budget rests on several assumptions that could prove too optimistic.
If growth does not come near the administration's assumptions, the budget plan will be as meaningless as if it omitted major spending items.
There were serious doubts about his ability to do this, however, and when Mr Primakov produced a budget in December it contained assumptions about help from foreign creditors which were widely regarded as unrealistic.
And although it would be foolish to assume that the economy will maintain today's dizzy pace, or that tax receipts will remain so high, the danger that the budget deal is based on unrealisable assumptions is fading fast.
As Peter suggested, I'm going to take just a few minutes to summarize the key economic assumptions underlying the fiscal 2011 budget.
The President made certain policy assumptions and added those into the budget.
To demonstrate this, Messrs Godley and Martin feed the assumptions of America's Congressional Budget Office for growth and fiscal policy into their own economic model.
"This is a hope-for-the-best pre-Budget... not a cautious set of assumptions, " said BBC economics editor Evans Davis.
Continued green-eyed obsession with projected 10-year budget deficits based on the jargon of baselines and assumptions that only a few can understand, and fewer still can master, will make them the party of austerity and zero-sum policies.
FORBES: President Obama Challenges The GOP With A Growth Standard
He said the government was "obviously" doing contingency planning - but had to operate on a "plausible set of assumptions", which would be set out by the Office for Budget Responsibility on Tuesday.
The assumptions about growth made by the White House in preparing last year's budget were as many economists said at the time unrealistic.
But with Greece's 2011 budget deficit for 2011 now estimated to have been 9%, two percentage points higher than forecast, those assumptions now look optimistic.
WSJ: Agenda: Greek Situation Is Most Serious of Latest Euro Crisis
Apparently heartened by what he calls a new Republican flexibility on taxes and economic assumptions, the president met with the GOP chairmen and the ranking Democrats of the House and Senate budget-writing committees.
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