VANCOUVER -- The head of the Bank of Canada gently urged businesses to ease open the purse strings and start spending Wednesday as he said the economy was nearing a tipping point toward normal growth following the global recession.

Stephen Poloz said he expects business investment to increase as confidence grows in that recovery.

"When the bubble burst in 2008, we were left with a crater, which is where we now find ourselves," Poloz told more than 600 members of the Vancouver Board of Trade.

"If you look carefully at a pot of simmering spaghetti sauce, under every bubble there is a crater that's equal in size. So a seven-year bubble, a seven-year crater. Central banks have been filling that crater with liquidity, so we can row our boats across it. We need to make sure we're getting to shore and not just hitting a rock."

Poloz said the economy is poised to return to normal, self-sustaining growth - gathering momentum in foreign demand, in particular from the U.S.

Doug Porter, chief economist of BMO Capital Markets, said Poloz's speech appeared designed not to rock markets ahead of an announcement from the U.S. Federal Reserve.

"He certainly wasn't scolding, like the former governor occasionally did on that topic. I think it was more like gently trying to encourage," Porter said.

The U.S. Federal Reserve said Wednesday that it would hold off on slowing its US$85-billion-a-month bond buying program until it saw more conclusive evidence the economic recovery will be sustained.

The Fed said that the economy was growing moderately, but rising mortgage rates and government spending cuts were restraining growth.

The announcement sent stock markets up sharply and bond yields tumbling.

Finance Minister Jim Flaherty noted the world economic recovery is still tenuous but the American recovery appears solid.

"The auto sector is a great example of that. The auto sector has come back strongly, including auto parts in the United States, and the housing sector has come back modestly, but it's come back after a number of years of decline," Flaherty said in Brampton, Ont. where he was announcing a tax break for manufacturers, following Poloz's speech.

"So the American economy is growing, it's growing modestly, that's good for our economy here in Canada."

Household debt has been considered by the Bank of Canada as a key domestic risk to the recovery to the economy.

Asked about housing prices in Canada and the record high ratio of debt-to-household income, Poloz reiterated he does not believe there is a housing bubble.

Despite a slight increase in long-term interest rates in recent weeks, he said interest rates remain extraordinarily low and debt service levels comfortable.

"I do think that people understand where they are, they understand what their exposure is," he said at a news conference following his speech.

"I'm comfortable that as our forecast unfolds, income will be growing faster than consumer debt and therefore the ration... will be declining through time."

Interest rates were cut to stimulate the economy during the recession, and that results in more debt -- particularly in the household sector, he said. That poses a risk that the debt load will go further than hoped.

"I would say we were more concerned about that a year ago, but things have calmed noticeably," Poloz said.

Income growth and slower growth in credit will accompany any interest rate increases, he said.

Canadian economic growth is expected to pick up in the third quarter following a weaker-than-expected second quarter that was hit by flooding in Alberta and a construction strike in Quebec.

In its July monetary policy report, the bank forecast growth averaging 1.8 per cent this year thanks to a stronger first quarter. It sees growth of 2.7 per cent in 2014 and 2015.