Canadians haven't put themselves deep enough in debt to cause a U.S.-style housing market bust, a CIBC World Markets economist says.

In a report issued Tuesday, Benjamin Tal asks: "Where's the trigger for a Canadian house price crash?" He concludes there isn't one.

"To be sure, house prices in Canada will continue to ease in the coming months," he says. "But the triggers that led to a free fall in Canadian real estate markets in the early 1990s and today in U.S. markets are nowhere to be found."

As he sees it, Canadian home buyers never got as reckless as Americans.

"By almost any measure, American households entered the current housing crisis from a more vulnerable position relative to their Canadian counterparts - carrying a heavier debt load and a much lighter net worth position. And when it comes to real estate speculation, Canada was not really a player.

"But even more important than the absolute and relative level of debt is the distribution of debt. At the peak of the cycle, subprime and Alt-A mortgages accounted for no less than 33 per cent of originations in the U.S. market. In Canada we estimate that at the peak, non-conforming mortgages reached 5.4 per cent of originations."

Subprime mortgages are those given to the least creditworthy borrowers. Alt-A mortgages are considered a step higher, although the category includes so-called liars' loans in which borrowers are not required to verify their earnings or assets.

Tal says the U.S. meltdown is basically a subprime story.

"Eradicate subprime from the U.S. housing market and, instead of the most severe house price meltdown since the great depression, you get a trivial moderate cyclical slowing - something along the line of what we are currently experiencing in Canada."