Presentation on theme: "Rank Size Rule Settlement. Learning outcomes To understand what the rank Size rule is and the pattern that it tries to outline."— Presentation transcript:
Rank Size Rule Settlement
Learning outcomes To understand what the rank Size rule is and the pattern that it tries to outline
Rank Size Rule This is an attempt to find a numerical relationship between population size of settlements within an area such as a country or county Settlements are ranked in descending order of population size, with the largest city first
Assumptions The 2 nd ranked city will have 1/2 the population of the 1 st The 3 rd ranked city will have 1/3 population of the 1st The 4 th ranked city will have a ¼ population of the 1st ranked city
Example The largest city has a population of 1,000,000 The 2 nd largest city: 1,000,000/2= 500,000 The 3 rd city: 1,000,000/3= 333,333 The 4 th city: 1,000,000/4= 250,000 And so on….
Formula This allows us to express the rank size rule as: Pn= Pl /n (or R) Pn= The population of the City Pl= The population of the largest city N (or R)= The rank size of the city See graph Page 404/405 Brazil e.g.
Variations from the Rank Size Rule It is rare to find a close correlation between the city size of a country and the rank size rule
Primate City This is found where the largest city (often the capital) completely dominates a country or region The population size will be many times greater than that of the 2 nd or 3 rd city
Example of Primate City: Buenos Aires Populations in thousands: Buenos Aires: 10,990 Cordoba: 1198 Rosario: 1096 Mendoza: 775 La Plata: 640 San Miguel de Tucuman: 622
Binary Distribution Occurs where there are 2 very large cities of almost equal size within the same country. One may be the capital and the other a major port or industrial centre Examples: Spain- Barcelona and Madrid
Exceptions to the rule Rank size rule is more likely to operate in a country that is developed or urbanised for a long time Large in size Stable economic and political organisation Primate distribution is likely to occur in countries that are small, less developed and only recently urbanised