politics-2016election-presedential and parliamentary system-electoral system

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question:Prime Minister Harper called an early election he believed the Conservatives would win. What structural and institutional constraints (the fact that Canada is a parliamentary system with single member districts) did Harper have to take into account, and how did these constraints make it more or less likely his party would win? How would the election have been different if Canada had a presidential system of government and/or used a proportional representation electoral system
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