kow_dude said:
I think question 4 is stupid. It's assuming that imports equals zero which is unrealistic in an economy.
Dude, of course a first year macro course is going to have things which are unrealistic in the economy. In fact, most of what Atta teaches is unrealistic in the economy or an incomplete picture. Is this because Atta's bad, or that the content would be too complex? Who knows. The economy is a complex thing.
The point is not realism, but whether or not you can apply the theory that you are being taught. If the accounting exam says "correct the mistakes made by the previous accountant", do you protest that "no accountant could be that useless?"
Nothing turns on the above, regardless, because X as given must mean NX. Ignoring the economic theory of imports being procyclical and so on, what are exports, as you claim, equal to when Y=3000? A negative number? Does that make sense if X-> exports?