All of the following factors can cause net exports to change:
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Changes in exchange rates - Fluctuations in the value of a country's currency can affect the cost of exports and imports, influencing net exports.
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Changes in price level - Variations in the domestic price level compared to foreign price levels can impact competitiveness and affect net exports.
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Changes in interest rates - Changes in interest rates can influence investment, savings, and consumption, thereby affecting imports and exports.
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Changes in national income abroad - When national income in other countries changes, it can affect their demand for a country's exports, thereby influencing net exports.
So, all options are correct.