So are you saying that the metrics I suggested aren't valid at all, or simply don't make a case for overpopulation existing?

I believe the percentage of income spent on food has been steadily dropping in the developed countries.

That's why I mentioned the worldwide average, not just developed countries.

Would you be fine with calling it the total economic wealth of the world?

Not total, average.

Anyway, it's no use going back-and-forth like this, because I feel like I'm seriously straying from my goal of being neutral and unbiased. I liked Manfred's response because he explicitly mentioned one well-defined issue he thinks I'm overlooking, rather than trying to overcomplicate the discussion.