Final answer:
Rio, Nairobi, and Caracas are all primate cities and economic hubs in their countries, with a significant concentration of population and influence on national culture and politics. They also face common urban challenges like rapid growth and infrastructure development.
Step-by-step explanation:
Rio de Janeiro, Nairobi, and Caracas all share the characteristic of being central urban areas that serve as economic hubs and primate cities in their respective countries—Brazil, Kenya, and Venezuela. These cities exhibit a high concentration of population and are often the cultural and political heart of the nation.
Additionally, they are known for having diverse natural resources which have been utilized to contribute to national wealth. These cities attract people from rural areas seeking employment opportunities, often leading to rapid urban growth and the associated challenges such as the development of informal settlements or slums.
Rio de Janeiro has been a historic capital and is a renowned center for travel and international business.
Caracas plays a significant role in Venezuela's economy, mostly through oil exports, and is a large urban center along the Caribbean coast. Nairobi serves as an economic hub in East Africa, continuously expanding and drawing people from surrounding rural areas.
These cities are all influenced by global economic trends and face common urban issues such as infrastructure development, poverty, and political turmoil.