在我们的模型中，价格水平P在短期内被认为是不变的，但实际上，永久性财政扩张导致的本币升值可能会通过降低某些进口价格而使P下降。如果永久性财政扩张的确使P有轻微下降，那么它对产出无影响这一结论是否仍成立(同上，假定初始条件为长期均衡)? Our model takes the price level P as given in the short run，but in reality the currency appreciation caused by a permanent fiscal expansion might cause P to fall a bit by lowering some import prices．If P can fall slightly as a result of a permanent fiscal expansion，is it still true that there are no output effects? (As above，assume an initial long-run equilibrium．)