The distinctive feature of the City cluster is the pre-eminence of foreign financial firms.
Make no mistake - the appointment of Joanna Shields as the new boss of London's Tech City cluster is a big coup for No 10.
The City's cluster of financial expertise, then, should keep it ahead of Frankfurt, the site of the new European central bank and the place most often touted as a rival to London.
Solidiance points to the city's tech cluster of Cyberport, envisioned in 1999 and built to help develop Hong Kong's IT industry.
Business travellers hoping for better views of the city and bay should consider the cluster of elegant hotel high-rises on the northern end of Marina Bay.
Founded in 1793 as a retreat for Duke Friedrich Franz I of what today is Mecklenburg-Vorpommern, Heiligendamm was known as the White City by the Sea for its cluster of 23 chalk-color buildings.
This makes it the first cluster of swine flu cases in the city without a link to someone who had traveled overseas.
CNN: Swine flu 'not stoppable,' World Health Organization says
In London many small hedge funds cluster in Mayfair, far west of the City and Canary Wharf where the big banks camp out.
Saudi Arabia, by far the biggest economy in the Gulf, is creating a cluster of its own economic zones, including King Abdullah City, which is aimed at foreign investors seeking a presence in the country.
Practically every big U.S. city and most states would love to become the next hot-biotech cluster.
Some companies use off-the-shelf statistics or highly generalized data on city rankings as a shortcut for the complex analysis needed to accurately prioritize and cluster locations.
Near Birmingham in Britain, for instance, the cluster of car-industry service firms that grew up when that city was a force in the industry has become an important element in the development of Formula One and other specialist vehicle businesses.
There's a cluster of them right in the middle of town on top of the City Hall, and no matter what direction you go you're, you're looking at a camera.
Northern cities have their equivalent of these third world shantytowns: inner city ghettoes, overcrowded housing projects, and suburban slums where racial minorities and immigrants and their children cluster, unable to find jobs or able to find only low-paying unskilled jobs unwanted by the dominant society.
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