The option that is not correct is: "Population is affected by the amount of money in circulation."
Population refers to the number of people living in a place, and it can change over time due to various factors such as birth, death, migration, and natural disasters. The population of a place is not static, meaning it can increase or decrease over time. Population is known through a census, which is a process of collecting and analyzing demographic data. However, population is not affected by the amount of money in circulation because money supply and population are two separate concepts that do not have a direct causal relationship.