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As noted earlier, a change in the exchange rate can, in the short run, affect the demand for and supply of commodities, and the competitiveness of US agriculture. When the US dollar strengthens or gains in value, it causes importers to pay more for the US dollar to buy US commodities.
For instance, the (GDP), unemployment rate, and even current interest rates (prime rates) can all affect currency exchange rates. However, it is possible for major political events (such as elections, wars, etc.) to also affect currency exchange rates.