A depreciation of the U.S. dollar can have the following effects on production costs and aggregate supply (AS):
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A higher dollar price of imported resources - This is correct, as depreciation makes imports more expensive in dollar terms.
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An increase in per-unit production costs from using imported resources - This is also correct, as the increased cost of imported resources leads to higher production costs for firms that rely on those imports.
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U.S. firms obtaining less foreign currency with each dollar - This is correct, as a depreciated dollar means it takes more dollars to buy foreign currency.
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A leftward shift of the AS curve - This is likely to happen because higher production costs can lead to a decrease in aggregate supply.
The other options would not typically apply in this context:
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A decrease in imported resources - Not necessarily true; the level may not decrease, but rather the cost increases.
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A lower dollar price of imported resources - Incorrect; a depreciation means a higher price in dollars.
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An increase in imported resources - Incorrect in general; it does not directly relate to depreciation effects.
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A shift of the AS curve rightward - Incorrect; typically not a result of depreciation, as production costs are likely to increase.
So the correct selections are:
- A higher dollar price of imported resources
- An increase in per-unit production costs from using imported resources
- U.S. firms obtaining less foreign currency with each dollar
- A leftward shift of the AS curve