Primate cities are cities in a country that have far more people and influence than every other city in it. For it to be called a primate city, it must have more than two times as many people and two times as much influence (such as in the country's economy, resources, education, health care, etc.) than the country's second largest city. Countries with primate cities usually have a large inequality in its development, but richer countries as well as poorer countries can have primate cities.