Find the domain of the vector function 
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Definitions:
Fixed Exchange-rate System
A currency system where the value of a country's currency is pegged to the value of another currency, a basket of other currencies, or another measure of value such as gold.
Demand for Dollars
Refers to the global desire or need for U.S. currency, driven by its use in international trade, investment, and as a reserve currency.
Balance of Payments Surplus
A situation where the total of the payments received from abroad exceeds the total of the payments made to abroad.
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