It’s not my policy to feel sorry for any politician – they’re all hugely ambitious volunteers – but I do feel sympathy for Treasurer Josh Frydenberg. He’s not the first treasurer to be strong on party dogma but light on economic understanding, but he’s among the first to be heading into stormy weather light on expert advice from a confident and competent Treasury.

There he was, thinking his first budget would be his last, primping up a pre-election budget that claimed to have fixed the economy and delivered on deficit and debt when that was all in the future and built on nothing more than years of wildly optimistic forecasts, combined with a massive tax bribe whose cost will keep multiplying for seven years.

Treasurer Josh Frydenberg discussing economics and policy. Alex Ellinghausen

Do you think that while cooking up the happy forecasts needed to justify his claims of Mission Accomplished and make his tax cuts seem affordable, Treasury warned him of the risks he was running, making himself and his government hostages to fortune?

I doubt it. They wouldn’t have been game to. The Coalition’s politicisation of Treasury, intended to kill its corporate sense of mission and replace it with people who’d proved their right-thinking and party loyalty as ministerial staffers, sent the message that the government wanted people who spoke only when spoken to and kept any contrary opinions to themselves.

In the process, however, most of the people with a deep understanding of macro-economic management have drifted away. People who understood the mysteries of the business cycle, with experience of recessions - and how excruciatingly painful they are for the government of the day.

These are people who know how much worse you make it for yourself – and for the economy voters depend on – by refusing to face the mess you’ve got yourself into, and who know how to help you change trams with as little loss of face as possible.

Worrying about deficit and debt is something national governments can afford to do only when they’ve got an economy that’s growing strongly

People game to tell you to stop digging. People who know that the longer you take to accept that the game has changed, the harder it will be to get the economy back on track – and, incidentally, to avoid getting the blame for completely stuffing it up.

People who’ll tell you to blame your about-face on changes coming from the rest of the world, but not to believe your own bulldust. People who’ll tell you to forget about party political doctrine – and the crowing of your opponents - and be completely pragmatic in doing whatever needs to be done to get you and the economy out of the poo.

Here’s what Frydenberg’s experts should be telling him, but probably aren’t – unless he speaks to Reserve Bank governor Dr Philip Lowe a lot more regularly than I imagine he does.

First, worrying about deficit and debt is something national governments can afford to do only when they’ve got an economy that’s growing strongly. The three successive quarters of pathetically weak growth we’ve experienced – complete with rising unemployment and underemployment - may prove to be just a blip, as the budget’s forecasts assume they will, but it’s much easier to believe they show the economy is fast running out of puff.

Recession is neither imminent nor inevitable in the next year or three, but with the economy in such a weakened state it is vulnerable to any adverse shock that happens along – whether of domestic or international in origin.

In such circumstances, it would be economically damaging and fiscally counterproductive (not to mention politically disastrous) to press on with fiscal consolidation rather give top priority to boosting economic activity and getting the economy back into strong-growth mode.

The problem is, the economy seems to be running out of puff because it’s caught in a vicious circle: private consumption and business investment can’t grow strongly because there’s no growth in real wages, but real wages will stay weak until stronger growth in consumption and investment gets them moving.

Policy has to break this cycle. But, as Lowe now warns in every speech he gives, monetary policy (lower interest rates) isn’t still powerful enough to break it unaided. Rates are too close to zero, households are too heavily indebted, and it’s already clear that the cost of borrowing can't be the reason business investment is a lot weaker than it should be.

That leaves the budget as the only other instrument available. The first stage of the tax cuts will help, but won’t be nearly enough. “Structural reform” is always a nice idea, but fixing a problem of deficient demand from the supply side would take far too long to be of practical help.

Over to you, Josh. If you’ve got the greatness in you, this could be your finest hour.

Ross Gittins is the Herald’s economics editor.