The apotheosis of this decadence was revealed in evidence to the robo-debt royal commission last week. Advice sought from an outside law firm, which found that the government’s cost-cutting scheme was unlawful, was paid for but not passed up the line to the minister – presumably because the bureaucrats judged it would not be welcome.

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But in a little-noticed part of a recent speech by Treasurer Jim Chalmers, he left no doubt that, under Labor, Treasury’s advice would be sought, and used to improve the government’s decisions. What’s more, Treasury’s ability to convey its views to the public would be enhanced.

Chalmers noted that, even after the government had dealt with the inflation challenge, “we will have to manage a budget weighed down by persistent structural spending pressures”. Doing this required new thinking and deeper thinking, he said.

“It requires us rebuilding the evidence base for policymaking. Because, to get better, more-forward-looking economic policies, we need better, more-forward-looking policy foundations.”

Chalmers revealed six ways in which he will be “rebuilding the evidence base for policymaking”. One was “putting Treasury back at the centre of climate modelling again”, to build on “the new approach to climate risks, costs and opportunities” revealed in last month’s budget papers.

Second, Treasury’s annual statement on “tax expenditures” would be made “more accessible, more useful analysis of what tax concessions are costing the budget” and their effect on the distribution of income between high and low earners.

Economists have long believed that such “tax expenditures” are equivalent to actual government spending in their effect on the budget balance, and should be subject to just as much critical reassessment as actual spending.

But the Libs didn’t agree. Since taxes are evil, anything you do to reduce them must be a good thing, even if the concessions go to some (usually higher-earning) taxpayers and not others. They sought to play down the tax expenditure statement – which hugely annoys the interest groups receiving concessions on such things as superannuation savings, and the 50 per cent discount on taxing capital gains – by renaming it the “tax benchmark and variations statement”. Not anymore.

The third, even more significant change will be the appointment of an “evaluator-general” to regularly and publicly examine the effectiveness of government spending programs. Many programs don’t do much to achieve their stated objectives, but ministers and their department heads are notoriously reluctant to have them rigorously examined, for fear of embarrassment.

But, as first proposed by economist Dr Nicholas Gruen, such a person and their agency would have similar powers and independence to those of the much-feared Auditor-General. This should work, provided governments couldn’t do what Morrison did to the Auditor-General: cut his funding.

The appointment of an evaluator-general is official Labor policy, and has been championed by the assistant assistant treasurer, Dr Andrew Leigh, whose outstanding economic expertise is negated by his failure to align with any Labor faction.

No doubt Leigh will be keen for the evaluator to make use of the latest in evidence-based decision-making, randomised controlled trials.

The point is that one thing Treasury (and the Finance department) should be hugely knowledgeable about – but aren’t – is what policies work, and what policies don’t. An evaluator-general will fill this vacuum.

Fourth, Treasury will work with Finance Minister and Minister for Women Katy Gallagher to “ensure gender considerations are at the core of our work”, building on last month’s “gender-responsive budgeting”.

Fifth, Treasury will produce Australia’s first “national wellbeing statement” next year, which will be “a hard-headed way to gauge progress by recognising that a robust and resilient economy relies on robust and resilient people and communities”.

And finally, Chalmers will step up production of the Intergenerational Report from five-yearly to three-yearly, in the middle year of each parliamentary term. He promises the document will be “depoliticised”.

It’s true that former treasurer Joe Hockey trashed this exercise by turning it into a blatant attack on his Labor predecessors. It was hard to take subsequent reports seriously, especially when they imposed an artificial cap on tax collections over the next 40 years, while letting government spending run wild.

We need the report to be a much more balanced assessment of future budgetary challenges, not just a Treasury tract on the supposed evils of runaway government spending. We need more acknowledgement of the possible effects of climate change on the budget over the next 40 years – a start to which was made in last month’s budget.

And it would be nice if the report lived up to its name by having much more to say about intergenerational equity issues and trends, such as the effect of ever-rising house prices, and the longer-term consequences of the way the Howard government kept stacking the odds in favour of the old at the expense of the young, particularly favouring the self-proclaimed “self-funded retirees” (who never mention the huge superannuation tax concessions they’ve been given, nor that many of them also get a part-pension).

So, well done, Jim. With better advice and a better “evidence base”, now all Labor needs is the courage to stand up to a few powerful interest groups, including those industries that get the relevant union to plead their case in the new-look Canberra.

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