汇率理论研究汇率的决定因素和汇率制度的选择；
The theory of exchange rate researches the factor deciding exchange rate and the choice of exchange rate system.
汇率制度的选择直接影响一国宏观经济政策的效力。
The choice of exchange rate system has a direct impact on the effectiveness of a country's macroeconomic policy.
汇率制度的选择直接影响一国宏观经济政策的效力。
The choice of exchange rate system directly influences the effect of macro economic policies.
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