If short-term capital is neither perfectly immobile nor perfectly mobile internationally, why is the predicted impact of

Question:

If short-term capital is neither perfectly immobile nor perfectly mobile internationally, why is the predicted impact of expansionary fiscal policy on the ambiguous?
Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...