Equality is the big one.
It's probably the hardest aspect of democracy to achieve without infringing on personal freedoms. In contemporary Australian culture, one of the biggest obstacles to equality is economic differences - as we also learnt, our system isn't immune to power which can be bought rather than earned. No doubt most VCE students would be appalled if VBOS accepted payments in return for, say, five or 10-point increases. In essence, if you've got the cash, you've got more opportunities. This decisively fails my politics-class definition of equality.