Answer:
Sumerian society was organized in city states, which consisted of a city and surrounding lands. ...Combined rural & urban areas into a city-state. It affected Sumer because the different city states fought each other.
A great population density generally occurs in big cities. New York has a lot of people in a small space compared to the countryside which might have a lot of people spread out.
Again there is not enough information to answer your question accurately but yeah cities have a high population density.
The term leakage reduces the flow of income in the circular flow, injections increase the flow of income to the circular flow.