What role do site and situation play in the development of primate cities?
Being next to a body of water greatly helps a city. It makes trade easier and can protect from attack.
What relationship do you see between primate cities and capital cities?
Primate cities are usually also capitol cities.
What might explain why some countries do not have a primate city?
A country that doesn't have a primate city is likely to have many big cities. Some may have a very high population, but one city does not stand out as a primate city.