The three different approaches to measuring the GDP are the expenditure approach, the blank approach, the blank approach and blank $.$ The expenditure approach aggregates the spending by the four sectors of the economy: $($a$)$ the household sector, $($b$)$ the blank sector, $($c$)$ the blank sector, and $($d$)$ the foreign sector, to yield the total GDP$.$ The largest spending in Canada$$s aggregate GDP comes from the blank sector. When using the income approach, the first step is to calculate the total national income by adding employee compensation, proprietor$$s income, blank $,$ net interest, and rental income.