Population density is a measure of the number of people living in an area relative to its size. Generally speaking, countries with higher population densities tend to have higher levels of economic development. This is because more people living in close proximity allows for greater access to resources and services, which can lead to increased productivity and economic growth. In addition, densely populated areas often experience higher levels of innovation due to the increased concentration of talent and ideas. As a result, many countries with high population densities have become leading global powers.