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【单选题】
Building an economic model based on the assumption of a small open economy is useful because:
A.
it accurately describes the U.S. economy
B.
it is more complicated and realistic than a model based on the assumption of a large open economy.
C.
this simplifying assumption can assist our understanding and intuition of open economy macroeconomics.
D.
it is not possible to build models of large open economies.
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