if the value of the US dollar raises or falls in relation to other currencies how will the economy be affected sort each effect into the category where it fits best

An increase of the value of a dollar causes U.S. exports to cost more for foreign markets to purchase. This also makes foreign imports less expensive for U.S. consumers. A decrease of the value of a dollar causes the same amount of foreign currencies buys more dollars. Foreign countries and it's residents will buy more U.S. products.

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a stronger central government  

its what they are