What makes primate cities "primate" is that they have a population that is at least twice as large as the next largest city in the country. This population dominance gives primate cities a centralizing influence, attracting resources, investment, and opportunities to the city at the expense of other urban areas. This concentration of population and resources in a single city can lead to disparities in development and resources distribution within the country.
Rephrase this sentence in 9th grade