Centru de tranzacționare a ratingului. Douăzeci de brokeri de conducere
The system is designed to reflect an underlying hierarchy whereby consumers and businesses go to a city of a certain size for a certain function; some functions are widely available and others are only available in the largest cities.
Forstall and released in The city rankings are updated periodically in the Rand McNally Commercial Atlas and Marketing Guide, an annual two-volume set, which is available in many libraries.
Among the criteria for categorization are retail sales, newspaper circulation, and the presence of universities and hospitals and corporate headquarters. The size of the city's tributary area is critical to determining whether it will be rated a 2, 3, or 4.
As ofthere are cities rated. The system consists of a number and a letter.
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The number reflects a city's importance in the national hierarchy. Nationally important business centers are ranked 1.
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Regional business centers are ranked 2. Significant local business centers are ranked 3 and business centers whose importance is purely local are ranked 4.
Doubled letters serve to distinguish centers within a class. The most important center in a market trading area is given some kind of A.
Other business centers in the same market area will be given B or C depending on their importance.
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B cities constitute basic trading centers, while C cities do not. Rand McNally divides the country into basic trading areas as centru de tranzacționare a ratinguluieach of which has exactly one A-rated city.
The basic trading areas are aggregated into major trading areas, of which there are The Federal Communications Commission uses these areas for determining wireless territory boundaries. Chicago was originally the only other city rated 1-AAA as having influence over a large area of the country.
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