什么时候使NX curve shift outward

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看了曼昆的书,关于实际汇率和NX的关系的图

好象Fiscal政策只是在along the curve, 真正能使NX curve shift inward or outward,只能是贸易政策(例如贸易保护等).

是这样的吗? 为什么fiscal 和monetary 政策不能影响NX curve to shift inward or outward?

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关键词：outward shift curve ward Out shift curve outward

NX=X-M , Therefore, only changes in X & M curves will shift the NX Curve.For example, government promotion on export may increase the export and shift the nx outward. While decreasing prefernce for imported (e.g. defence for foreign goods), may shift the nx upward too. Changes in income may only cause movement along the curves , while changes in factors other than income will shift the curves.

Fiscal policy may affect income by changing T or G. but it does not affect X & M Curve. Thus, with increasing income , the economy will move along the M curve only.

 

I dont know wheather I solve your question, anyway I have tried my best. Thanks