You could write a 20 marker on it (and I pretty much did in last year's HSC, that was my best section - my raw mark was 20/20).
Quickly though:
positive - facilitates domestic economic growth as the borrowed money would be a stimulus to the economy (e.g. the whole mining boom kind of line of argument)
negative - debt may become unsustainable (debt-trap), investor confidence may decrease leading to interest rate increases
There's way more that you could speak about - the key thing to get full marks in this question though is to consider for and against, cause it is asking you to analyse. So by mentioning the potential positive(s) you impress the marker and that's how you go from say 3/4 to 4/4 or 5/6 to 6/6
