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ECS3703 Assignment 1
(COMPLETE ANSWERS)
Semester 1 2026 - DUE 2
April 2026
NO PLAGIARISM
[Pick the date]
[Type the abstract of the document here. The abstract is typically a short summary of the contents of
the document. Type the abstract of the document here. The abstract is typically a short summary of
the contents of the document.]
,Exam (elaborations)
ECS3703 Assignment 1 (COMPLETE
ANSWERS) Semester 1 2026 - DUE 2 April
2026
ECS3703 Assignment 1 (COMPLETE ANSWERS) Semester 1 2026 - DUE 2
April 2026; 100% TRUSTED Complete, trusted solutions and explanations.
Assume that the Southern African Development Community (SADC) countries
operate under flexible exchange rate systems, and they desire to maintain
balanced current accounts and reach full employment. (a) Explain which
macroeconomic policy these countries should use to achieve this under a
scenario of perfect capital mobility and imperfect capital mobility, and why?
To analyze the appropriate macroeconomic policies for SADC countries under these conditions,
we use the Mundell-Fleming Model. This framework examines the interaction between the
goods market (IS curve), the money market (LM curve), and the balance of payments (BP curve)
under different degrees of capital mobility.
1. Scenario: Perfect Capital Mobility
Under perfect capital mobility, the BP curve is a horizontal line at the world interest rate ($i =
i^*$). Any deviation from this rate causes instantaneous and massive capital flows.
Recommended Policy: Monetary Policy
In a flexible exchange rate system with perfect capital mobility, monetary policy is highly
effective, while fiscal policy is completely ineffective for influencing output.
Why Monetary Policy Works: If the central bank increases the money supply, domestic
interest rates fall below the world rate ($i < i^*$). This leads to a capital outflow as
investors seek higher returns abroad. To move funds, they sell the domestic currency,
causing it to depreciate. Under a flexible system, this depreciation makes exports
cheaper and imports more expensive, improving the net export component of the current
account. This shifts the IS curve to the right until full employment is reached.
Why Fiscal Policy Fails: An expansionary fiscal policy (increased government
spending) would push interest rates up ($i > i^*$). This attracts massive capital inflows,
, causing the currency to appreciate. The appreciation worsens the current account (net
exports fall) to the exact extent that the fiscal stimulus increased demand, resulting in
zero net change in total output.
2. Scenario: Imperfect Capital Mobility
Under imperfect capital mobility, the BP curve is upward-sloping. Capital flows respond to
interest rate differentials, but not instantaneously or infinitely, due to transaction costs, risks, or
capital controls.
Recommended Policy: A Mix of Monetary and Fiscal Policy
In this scenario, both policies have some degree of effectiveness, but monetary policy remains
the more potent tool for addressing both the current account and employment simultaneously.
Monetary Policy Influence: An expansionary monetary policy still triggers a currency
depreciation. Because capital is less mobile, the depreciation happens more gradually, but
it consistently improves the current account and stimulates domestic demand to move
toward full employment.
Fiscal Policy Limitations: While fiscal policy can increase output (it is not "crowded
out" by appreciation as severely as it is under perfect mobility), it often creates a conflict
between goals. Increased government spending typically leads to a current account
deficit as higher income increases the demand for imports.
Why Monetary Policy is Preferred for Both Goals
To maintain a balanced current account while reaching full employment, monetary policy is
superior because its primary transmission mechanism—exchange rate depreciation—works in
favor of the current account.
1. Employment: It lowers interest rates and stimulates investment.
2. Current Account: The resulting depreciation increases the competitiveness of SADC
exports, helping to balance the trade account.
Summary Table
Feature Perfect Capital Mobility Imperfect Capital Mobility
Effective Policy Monetary Policy Monetary Policy (is most effective)
ECS3703 Assignment 1
(COMPLETE ANSWERS)
Semester 1 2026 - DUE 2
April 2026
NO PLAGIARISM
[Pick the date]
[Type the abstract of the document here. The abstract is typically a short summary of the contents of
the document. Type the abstract of the document here. The abstract is typically a short summary of
the contents of the document.]
,Exam (elaborations)
ECS3703 Assignment 1 (COMPLETE
ANSWERS) Semester 1 2026 - DUE 2 April
2026
ECS3703 Assignment 1 (COMPLETE ANSWERS) Semester 1 2026 - DUE 2
April 2026; 100% TRUSTED Complete, trusted solutions and explanations.
Assume that the Southern African Development Community (SADC) countries
operate under flexible exchange rate systems, and they desire to maintain
balanced current accounts and reach full employment. (a) Explain which
macroeconomic policy these countries should use to achieve this under a
scenario of perfect capital mobility and imperfect capital mobility, and why?
To analyze the appropriate macroeconomic policies for SADC countries under these conditions,
we use the Mundell-Fleming Model. This framework examines the interaction between the
goods market (IS curve), the money market (LM curve), and the balance of payments (BP curve)
under different degrees of capital mobility.
1. Scenario: Perfect Capital Mobility
Under perfect capital mobility, the BP curve is a horizontal line at the world interest rate ($i =
i^*$). Any deviation from this rate causes instantaneous and massive capital flows.
Recommended Policy: Monetary Policy
In a flexible exchange rate system with perfect capital mobility, monetary policy is highly
effective, while fiscal policy is completely ineffective for influencing output.
Why Monetary Policy Works: If the central bank increases the money supply, domestic
interest rates fall below the world rate ($i < i^*$). This leads to a capital outflow as
investors seek higher returns abroad. To move funds, they sell the domestic currency,
causing it to depreciate. Under a flexible system, this depreciation makes exports
cheaper and imports more expensive, improving the net export component of the current
account. This shifts the IS curve to the right until full employment is reached.
Why Fiscal Policy Fails: An expansionary fiscal policy (increased government
spending) would push interest rates up ($i > i^*$). This attracts massive capital inflows,
, causing the currency to appreciate. The appreciation worsens the current account (net
exports fall) to the exact extent that the fiscal stimulus increased demand, resulting in
zero net change in total output.
2. Scenario: Imperfect Capital Mobility
Under imperfect capital mobility, the BP curve is upward-sloping. Capital flows respond to
interest rate differentials, but not instantaneously or infinitely, due to transaction costs, risks, or
capital controls.
Recommended Policy: A Mix of Monetary and Fiscal Policy
In this scenario, both policies have some degree of effectiveness, but monetary policy remains
the more potent tool for addressing both the current account and employment simultaneously.
Monetary Policy Influence: An expansionary monetary policy still triggers a currency
depreciation. Because capital is less mobile, the depreciation happens more gradually, but
it consistently improves the current account and stimulates domestic demand to move
toward full employment.
Fiscal Policy Limitations: While fiscal policy can increase output (it is not "crowded
out" by appreciation as severely as it is under perfect mobility), it often creates a conflict
between goals. Increased government spending typically leads to a current account
deficit as higher income increases the demand for imports.
Why Monetary Policy is Preferred for Both Goals
To maintain a balanced current account while reaching full employment, monetary policy is
superior because its primary transmission mechanism—exchange rate depreciation—works in
favor of the current account.
1. Employment: It lowers interest rates and stimulates investment.
2. Current Account: The resulting depreciation increases the competitiveness of SADC
exports, helping to balance the trade account.
Summary Table
Feature Perfect Capital Mobility Imperfect Capital Mobility
Effective Policy Monetary Policy Monetary Policy (is most effective)
