Question

Foreign trade influences the economy's aggregate demand in which of the two ways?

• A. Expenditure, Revenue
• B. Input, Output
• C. Leakage, Injection
• D. Employment, Productivity

Hint:

Leakages Withdrawals: Savings ($S$), Taxes ($T$), Imports ($M$).
Injections: Investment ($I$), Government Spending ($G$), Exports ($X$).
At macroeconomic equilibrium: $S + T + M = I + G + X$.

Answer 1

The Correct Option is C

Concept:
In open economy macroeconomics, the inclusion of the external sector fundamentally modifies the circular flow of national income and aggregate demand.
International transactions introduce opposing monetary flows into the domestic expenditure stream.

Step 1: Economic Role of Foreign Trade in Aggregate Demand:
Aggregate expenditure in an open economy is formalized as:
\[ AD = C + I + G + (X - M) \] Imports ($M$) represent domestic expenditures diverted toward purchasing foreign output.
Because this spending escapes the circular flow of domestic income and does not generate domestic production, it functions as a leakage or withdrawal from the domestic economy.
Conversely, exports ($X$) represent spending by foreign economic agents on domestically produced goods and services.
This autonomous inflow adds directly to the circular flow of domestic income, acting as an injection into aggregate demand.

Step 2: Evaluation of Incorrect Options:
Expenditure and revenue are accounting and budgetary terms, not the theoretical transmission channels of trade into aggregate demand.
Input and output describe production functions and microeconomic technology relationships.
Employment and productivity are long-run economic outcomes rather than circular flow mechanisms influencing aggregate demand directly.
Final Answer:
Foreign trade impacts aggregate demand precisely through the dual channels of leakages (imports) and injections (exports).