Solution
Option 1 -> When only domestic income increases, imports rise, causing depreciation.
Option 2 -> When only foreign income increases, exports rise, causing appreciation.
Option 3 -> When both incomes increase simultaneously, two opposing forces act on the currency - the net effect is indeterminate.
Option 4 -> There is no theoretical basis for this specific sequential pattern.
Hence, Option 3: May or may not depreciate -> When domestic income increases, demand for imports rises, increasing demand for foreign currency (depreciation pressure). When foreign income increases, demand for exports rises, increasing demand for domestic currency (appreciation pressure). Since both occur simultaneously, the net effect on the exchange rate depends on the relative magnitudes of income changes and marginal propensities to import in both countries. If domestic income effect dominates, currency depreciates; if foreign income effect dominates, currency appreciates. Therefore, the outcome is indeterminate without knowing these relative magnitudes. -> correct
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