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The urban economy as a scale-free network

Författare och institution:
Claes Andersson (Institutionen för fysisk resursteori); Anders Hagson (Institutionen för stadsbyggnad); Alexander Hellervik (-); Kristian Lindgren (Institutionen för fysisk resursteori); Jonas Tornberg (Sektionen för arkitektur)
Publicerad i:
Physica A: Statistical Mechanics and its Applications, 345 ( 1 ) s. 227-244
ISSN:
0378-4371
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2003
Språk:
engelska
Sammanfattning (abstract):
Abstract Power laws in socioeconomic systems are generally explained as being generated by multiplicative growth of aggregate objects. In this paper we formulate a model of geographic activity distribution with spatial correlations on the level of land lots where multiplicative growth is assumed to be dominant but not exclusive. The purpose is to retain the explanatory power of earlier models due to Simon, Gibrat and others while attaining some additional properties that are attractive for both empirical and modelling purposes. In this sense, the model presented here is a combination of the two factors that have been identified as central to urban evolution but rarely appear unified in the same model: transportation costs and multiplicative growth. The model is an elaboration of a previously reported complex network model of geographical land value evolution. We reproduce statistical properties of an empirical geographical distribution of land values on multiple hierarchical levels: land value per unit area, cluster areas, aggregated land value per cluster and cluster area/perimeter ratios. It is found that transportation effects are not strong enough to disturb the power law distribution of land values per unit area but strong enough to sort nodes to generate a new set of power laws on a higher level of aggregation. The main hypothesis is that all these relations can be understood as consequences of an underlying growing scale-free network of geographic economic interdependencies.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
NATURVETENSKAP ->
Fysik
Nyckelord:
Complex networks; Urban growth; Land values; Spatial networks; Power laws; Random multiplicative growth
Chalmers styrkeområden:
Samhällsbyggnad
Transport
Postens nummer:
167648
Posten skapad:
2012-12-13 10:30

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