How well-represented is the average person, or the average dollar?

Consider the three pie charts below, which show (1) the percentage of NGOs at the UN headquartered in OECD nations, G77 nations, or nations that are neither OECD nor G77 members against (2) the percentage of world population living in each group and (3) the percentage of world GDP (by purchasing-power parity) living in each group. Note that the UN representation is much closer to GDP percentage than to population percentage.