New Democratic Party leader Thomas Mulcair speaks during Question Period in the House of Commons on Parliament Hill in Ottawa December 10, 2012. (REUTERS/Chris Wattie)

OTTAWA - Yet another study has found that a Canadian dollar boosted by high oil prices isn't a big factor in manufacturing declines, but NDP Leader Thomas Mulcair isn't buying it.

A new Macdonald-Laurier Institute study takes at swipe at "those who mistakenly continue to view our industrial heartland as a bombed-out ruin," saying so-called Dutch disease has been exaggerated and that manufacturing has been rising since 2009.

Mulcair dismissed that.

"The study by Prof. Coulombe and his team that was done for Industry Canada shows that of the 600,000 good-paying manufacturing jobs that have been lost in this country over the past seven years, many of them are attributable to the fact that the Canadian dollar is artificially high," he said.