Semester 2 2025 - DUE September 2025; 100%
TRUSTED Complete, trusted solutions and
explanations.
1. Effects of Expansionary Fiscal Policy under Fixed Exchange
Rates in an Open Economy (18 marks)
Scenario:
Country is at its natural level of output (Y_n), in
equilibrium.
Fixed exchange rate regime.
Government increases spending or reduces taxes.
Step-by-Step Mechanism (IS–LM–BP model):
1. Initial Equilibrium:
IS (goods market), LM (money market), and BP (balance
of payments) curves intersect at Y_n and interest rate i_0.
2. Fiscal Expansion:
↑ Government spending (or ↓ taxes) → IS curve shifts
right from IS_0 to IS_1.
3. Effect on Interest Rates & Capital Flows:
o Higher income → higher money demand → interest
rates rise above world interest rate i*.
, o Capital inflow due to higher interest rates → upward
pressure on domestic currency.
4. Central Bank Intervention (Fixed Exchange):
o To maintain fixed rate, central bank buys foreign
currency (sells domestic currency) → ↑ money
supply.
o LM curve shifts right from LM_0 to LM_1.
5. Final Outcome:
o Output increases beyond Y_n in the short run (to
Y_1).
o Interest rate returns to world level i*.
o Balance of payments remains in equilibrium due to
central bank intervention.
Diagram:
Axes: Interest rate (i) on vertical axis, Output (Y) on
horizontal.
Plot IS_0, LM_0, BP through equilibrium E_0 at (Y_n, i*).
Shift IS right → temporary disequilibrium with BP surplus.
LM shifts right → new equilibrium E_1 at higher Y, same
i*.
Summary Table:
, Variable Short-run Effect
Output (Y) ↑
Interest rate No change (ends at i*)
Money supply ↑
Exchange rate Constant
BP position Balanced after intervention
2. Difference between Dollarization and an Optimum Currency
Area (10 marks)
Optimum Currency Area
Feature Dollarization
(OCA)
Adoption of
A geographic/economic
another country's
region sharing a single
Definition currency (e.g.,
currency and monetary
USD) as legal
policy.
tender.
Ecuador, Panama,
Eurozone (Germany,
Examples Zimbabwe (full
France, Italy, etc.).
dollarization).
Control over No control –
Shared control through a
Monetary monetary policy
supranational central bank
Policy set by foreign