OTTAWA — Former Conservative prime minister Stephen Harper will deliver the closing speech of Prime Minister Mark Carney’s first Canada Investment Summit on Tuesday. A senior government source confirmed Harper’s long-rumoured participation in the Liberal prime minister’s event to National Post on Sunday. The Canada Investment Summit in Toronto is Carney’s flagship event to pitch foreign and domestic investors on investing in Canadian projects. As part of the pitch, the government has circulated a list of over 160 projects that are seeking investments ranging from $25 million to...