【单选题】
从经济理性角度分析，当一国存在即期消费的时间偏好时，其合理的经常账户余额应为_______；而当其资本边际生产率较高时，合理的经常账户余额应为__________
A. 顺差/顺差
B. 顺差/逆差
C. 逆差/逆差
D. 逆差/顺差
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答案
C
解析
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