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When companies produce and market their products and services in many different countries, they are subject to the impacts of sometimes favorable and sometimes unfavorable changes in currency echange rates. The rates of exhange between different currencies can vary by as much as 20 to 40 percent annually, or more, with the changes occuring sometimes gradually and sometimes swiftly. It follows then that shifting echange rates have a big impact on domestic manufacturers' ability to compete with foreign rivals. For what reasons would a U.S. based manufacturer locked in a fierce competitive battle with low-cost foreign imports benefit from a weaker U.S. dollar?