Suppose a Canadian firm imports bananas of $ 1000 and sells them for $ 2000. The effect on GDP would be

Gross Domestic Product (GDP) measures domestic value added, calculated under the expenditure method as GDP = C + I + G + (X − M). When the Canadian firm imports bananas for $1,000 (increasing Imports M by $1,000) and sells them domestically to consumers for $2,000 (increasing Consumption C by $2,000), the net domestic value added contributed to Canada's GDP is $2,000 − $1,000 = $1,000, so GDP increases by $1,000.