At most, you would have to define externalities. You don't need to define positive and negative externalities, because it is pretty much self-explanatory once you've defined externalities.
Kuznets Curve is not in HSC syllabus, nor it is covered by the dominant textbooks (i.e. not covered in Leading Edge, Riley or Excel). Might be in Bulmer, but Bulmer seriously doesn't understand what is within the limits of HSC.
Just some information:
This year Baulko for the first time had 5 extension 2 maths (total - 111 students) classes instead of the usual 4, supposedly violating the gentlemen's agreement you raised earlier.
The head teacher was reluctant to form 5 4u classes, but he did so because extension 1...
It's very hard to handle 12+ units, especially when doing 4u maths.
I would recommended letting go of 3U English, from what I hear, the workload is effectively like 2U English... This fear you have of 2U English not going well will matter even if you do 3u, because at least one unit from 2u...
two things:
a) can we get back on topic
b)
actuarial is not just maths. look at the compulsory units for actuarial at unsw:
•ACTL1101 The Financial Life-Cycle (6 UOC)
•ACTL1122 Corporate Governance for Actua (6 UOC)
•ECON1101 Microeconomics 1 (6 UOC)
•ECON1102 Macroeconomics 1 (6 UOC)...