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are included. Selection criteria may be based on a yardstick value (e.g., if the producer-service sector is the largest sector then city is a world city) or on an imminent determination (if the producer-service sector of city is greater than the combined producer-service sectors of other cities then city is a world city.) Although criteria are variable and fluid, typical characteristics of world cities include:
* The most prominent criterion has been providing a variety of international financial services,

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