World Travel City Photography

Global cities
A global city, also known as a world city, is a prominent centre of trade, banking, finance, innovation, and markets. The term "global city", as opposed to megacity, was coined by Saskia Sassen in a seminal 1991 work. Whereas "megacity" refers to any city of enormous size, a global city is one of enormous power or influence. Global cities, according to Sassen, have more in common with each other than with other cities in their host nations. Notable examples of such cities include New York City, London, Chicago, Paris, Beijing, Tokyo, Hong Kong, Los Angeles, Mumbai, Singapore, and Shanghai.
The notion of global cities is rooted in the concentration of power and capabilities within all cities. The city is seen as a container where skills and resources are concentrated: the better able a city is to concentrate its skills and resources, the more successful and powerful the city. This makes the city itself more powerful in the sense that it can influence what is happening around the world. Following this view of cities, it is possible to rank the world's cities hierarchically.
Critics of the notion point to the different realms of power. The term global city is heavily influenced by economic factors and, thus, may not account for places that are otherwise significant. For example, cities like Rome, Istanbul, Mecca, Mashhad, Karbala, Jerusalem and Lisbon are powerful in religious and historical terms but would not be considered "global cities." Additionally, it has been questioned whether the city itself can be regarded as an actor.