A country’s economic success and international prestige depend on whether or not it has one or several cities that serve as global hubs for human resources, investments, and technologies. Such cities are the face of the country and the foundation for national development.
What are they like, modern superstar cities? Borrowing a metaphor from astronomy, we can say that some cities are blue giants — the world capitals that have been world leaders for decades. In contrast, others are supernovas — the ever-expanding megacities in developing countries. The rest are the fast-paced, flashy comets — these cities suddenly soar to fame thanks to a specific feature.