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The oil boom that powered Canada’s recovery from its 2009 recession is turning into a bust for the nation’s dollar.

Canada’s currency tumbled this month to a five-year low of C$1.1385 per U.S. dollar as the price of oil, the country’s biggest export, fell 30% from a June peak. Without a sustained increase in crude, the local dollar will weaken at least another 4% to C$1.18, according to Toronto-Dominion Bank and Royal Bank of Canada, the nation’s two biggest lenders.

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“The risk is, a sustained push lower in oil prices cuts Canadian growth,” Shaun Osborne, the chief currency strategist at Toronto-Dominion, Canada’s largest bank, said by phone on Oct. 15. “Any sort of setback for growth and investment in the energy sector is likely to have a fairly significant knock-on effect for the rest of the economy.”

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The slide in oil, caused by a combination of oversupply and falling global demand, is a setback for Canada. Since the recession, most new business investment and jobs have come from the oil-rich province of Alberta. The nation’s trade surplus turned into a deficit in August, and economic growth stalled the previous month.