Fill in the blanks to make the following statements correct.

a. If, when measuring Canada's national output, we add the market values of all firms' outputs in Canada, then we are committing the error of Such ________ an amount would greatly ________ the economy's actual output.

b. Statisticians use the concept of _______ to avoid double counting in measuring national income. Each firm's _______ is the value of its output minus the costs of ______ that it purchases from other firms.

c. If we measure GDP from the expenditure side, we are adding four broad categories of expenditure: ________, ___________, ________  and _________ . As an equation it is written as GDP = ____________ .

d. If we measure GDP from the income side, we are adding three main components of factor incomes: __________,____________,  and ____________ To these items we must add non-factor payments of _____________ and ____________