Opposition politicians may be slamming the spending plans of the new Canadian government, but there’s a reason economists aren’t exercised:

Ottawa can afford to do it, it promised to do it, and it has a responsibility to do it.

“Even with such deficits, the debt-to-GDP ratio should remain low relative to other OECD economies,” said National Bank Financial senior economist Marc Pinsonneault.

“In our view the government has the flexibility to provide fiscal stimulus to a Canadian economy that badly needs it.”

Mr. Pinsonneault was referring to Finance Minister Bill Morneau’s fiscal and economic update yesterday, which showed swelling deficits even without his Liberal government’s spending plans.

As The Globe and Mail’s Bill Curry reports, Mr. Morneau now projects a deficit of $18.4-billion in fiscal 2016-17, followed by another of $15.5-billion a year later. The budget will be unveild March 22.

When you add in the spending promises of the fall election campaign, those shortfalls look to come in at more than $25-billion in each year.

Indeed, there have been calls for the government to go above and beyond its campaign pledges given the severe hit to the economy from the oil shock.

Both Ottawa and the Organization for Economic Co-operation and Development now forecast economic growth of just 1.4 per cent in Canada this year, and other projections suggest 1 per cent or lower. Unemployment is projected to stick stubbornly near the 7-per-cent mark.

But, economists say, once you put it in perspective it’s nothing to fret over at this point.

And when you do that, it “should hardly scare off foreign investors,” Mr. Pinsonneault said.

“Ottawa can clearly afford a moderate fiscal boost without doing lasting damage to the long-term debt outlook,” BMO Nesbitt Burns chief economist Douglas Porter and senior economist Robert Kavcic said in a report on Mr. Morneau’s update.

“The federal debt-to-GDP ratio has dipped in each of the past two years, and remains relatively low at 31 per cent,” they added.

“Additionally, total government debt (including other layers of government) remains comfortably below levels that prevailed during the mid-1990s when Canada’s credit rating fell under pressure.”

To be clear, Mr. Porter and Mr. Kavcic advise moving cautiously, keeping spending in check, but they “fully agree that a moderate dose of stimulus is an entirely appropriate response to current economic realities.”.

There are still questions about whether the Liberal stimulus will do the trick given the ever-sinking economic outlook.

Including those measures, the 2016-17 deficit would equal only about 1.5 per cent of GDP, which is “hardly a blow-up,” said CIBC World Markets chief economist Avery Shenfeld.

“The only question is whether the modest dose of stimulus pledged in the campaign (roughly a half-per-cent of GDP) is enough to counter the drag on the economy from low commodity prices,” he added.

Bank of America Merrill Lynch also noted that Ottawa could come in with an “even larger” budget gap in a month.

“With Morneau stating that it’s ‘difficult’ to balance the budget by 2019-2020, we expect an extended period of large deficits,” economist Emanuella Enenajor and strategists Ralph Axel and Ian Gordon said in a report.