The correct option is To restrict GDP to output generated within national boundaries.
Explanation
The expenditure method calculates Gross Domestic Product (GDP) by summing the total spending on final goods and services within an economy. The mathematical formula is GDP = C + I + G + (X - M), where C represents Consumption, I is Investment, G is Government Expenditure, X is Exports, and M is Imports.Reasoning for Deducting Imports:
- Inclusion in Domestic Spending: The components of aggregate demand-Consumption (C), Investment (I), and Government Expenditure (G)-include spending on all goods and services, regardless of their origin. For instance, if a consumer purchases an imported smartphone, that expenditure is recorded under Consumption (C).
- Isolating Domestic Production: GDP is defined as the market value of all final goods and services produced within the domestic territory of a country.
- The Accounting Adjustment: Since imported goods are produced abroad but are included in C, I, and G, their value must be subtracted to prevent overestimation. Deducting Imports (M) cancels out the spending on foreign goods, ensuring that the final GDP figure reflects only domestic production.
Analysis of Incorrect Options:
- To remove the value of foreign-produced goods included in domestic expenditure: While imports are conceptually considered a "leakage" in the circular flow of income, the specific reason for their deduction in the GDP formula is the accounting necessity to exclude foreign production, not merely their status as a leakage.
- Because imports reduce the value of domestic production: This is factually incorrect; the value of imports can be higher or lower than exports depending on the country's trade balance.
- To separately compute the trade balance: While (X - M) does show the trade balance, the primary purpose of subtracting M in the GDP context is to isolate domestic output, not specifically to calculate the deficit.
Key Takeaway:
In the expenditure method, imports are subtracted to offset their inclusion in consumption, investment, and government spending figures, thereby ensuring that GDP strictly measures domestically produced goods and services.