J curve is no longer valid due to growth in Australian equity abroad. Increases in O/S Debt and debt serving from AUD depriciation is cancelled out by rise in our O/S Equity and increased returns from these overseas investments so Net Foreign Liabilities and Net Income is largely unchanged e.g. despite a 20% deprication of the AUD over 97-98, Net O/S Debt and Net Income actually fell slightly.
I don't think J curve is still in the syllabus.