In shaping this year's budget - their most important macro-economic task
 for the year - Tony Abbott and Joe Hockey face a dilemma: the timing 
for a particularly tough budget may be right politically, but it's 
anything but right economically.
It's clear they intend to follow the 
example of John Howard and Paul Keating by using the first budget after 
their election to have an almighty cleanout and strike a lasting blow 
for fiscal sustainability.
A lot of this simply involves replacing
 policies favouring your predecessors' heartland supporters with those 
favouring your own supporters - that is, making room for your election 
promises - but it has to go further and achieve a significant net 
improvement in the "structural" budget balance (the balance we would 
have if this were a normal year in the business cycle).
The first 
budget after a government's election is the one where it can take 
unpopular measures with greatest political impunity. You blame it all on
 the incompetence of your predecessors, and you give voters the maximum 
time to forgive and forget before the next election.
Fine. But the
 economy is so fragile at present, and its transition from mining-led to
 non-mining-led growth so tentative and uncertain, that Hockey would be 
crazy to produce a budget that cut the deficit significantly in the 
coming financial year or even the one after.
You can't be 
forecasting growth as weak as 2.5 per cent, with slowly worsening 
unemployment this year and next - implying below-trend growth for three 
years in a row - and also be tightening fiscal policy. After all, the 
Labor government's eminently worthy "deficit exit strategy" (which it 
only pretended to stick to) kicked in only "once the economy returns to 
above-trend growth".
The sad truth is the economy's prospects are 
so uncertain - and the fall-off in mining construction spending so 
unpredictable - that Hockey must not only avoid doing anything that adds
 to the weakness, but also stand ready to inject emergency fiscal 
stimulus the moment it becomes clear a collapse in mining investment 
threatens to push us into overall contraction.
The point is that, 
while it's undeniable we need to return the budget to cyclical surplus 
(and structural balance), this shouldn't happen - and, thanks to our 
still low level of public debt, doesn't need to happen - with any 
urgency.
So, how should Hockey resolve this contradiction between 
smart politics and responsible macro-management and avoid the charge 
that he's descended to a counter-productive policy of "austerity"?
One
 solution would be to announce all the tough measures in May, and get 
them through Parliament, but time them to start only slowly, then build 
up rapidly in the "out years" - by which time, we presume, the economy 
will have returned to healthy growth.
An alternative, but riskier 
approach would be to press on with the deficit-reducing measures, but 
offset their contractionary effect by embarking on a big new program of 
spending on infrastructure. This makes the point federal governments 
have hitherto ignored in their rhetoric: it's only the recurrent (or 
operating) budget that needs to be balanced over the cycle.
It's 
perfectly responsible for capital works spending to be financed partly 
by borrowing - thereby requiring future generations to contribute to the
 cost of the long-lasting infrastructure they benefit from - provided 
the projects aren't wasteful but yield a high social return.
Another
 worry is Hockey's statement before Christmas that his budget-repair 
measures would be limited to cuts in government spending, which was 
reinforced by Abbott's homily at Davos praising smaller government and 
lower taxes.
As John Daley of the Grattan Institute has noted, 
there's no precedent for successful fiscal consolidation here or 
elsewhere that didn't involve both spending cuts and tax increases.
The
 plain fact is that, though there's much scope for spending cuts - 
reduced business welfare, including subsidies to chemists, inefficient 
arrangements with fee-for-service doctors, home-made submarines, 
excessively generous grants to well-off private schools and so on - no 
remotely plausible list of spending cuts would be sufficient to achieve 
fiscal sustainability.
This is mainly because the greatest single 
contributor to Treasury's projections of unending budget deficits is the
 inexorable real growth in spending on healthcare. Any pollie who 
imagines they could do any more than temporarily slow that growth, or 
cover its cost by never-ending cuts in other areas of spending, is an 
ideologically crazed fool.
The other problem is that for many 
years much "spending" by governments has taken the form of tax 
exemptions, rebates and other concessions. Unless Hockey and Abbott's 
definition of spending cuts includes cuts in "tax expenditures" I can 
tell you now their efforts will fall far short.