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**Harvard**

Andersson, C., Hagson, A., Hellervik, A., Lindgren, K. och Tornberg, J. (2003) *The urban economy as a scale-free network*.

** BibTeX **

@article{

Andersson2003,

author={Andersson, Claes and Hagson, Anders and Hellervik, Alexander and Lindgren, Kristian and Tornberg, Jonas},

title={The urban economy as a scale-free network},

journal={Physica A: Statistical Mechanics and its Applications},

issn={0378-4371},

volume={345},

issue={1},

pages={227-244},

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.
},

year={2003},

keywords={Complex networks; Urban growth; Land values; Spatial networks; Power laws; Random multiplicative growth},

}

** RefWorks **

RT Journal Article

SR Print

ID 167648

A1 Andersson, Claes

A1 Hagson, Anders

A1 Hellervik, Alexander

A1 Lindgren, Kristian

A1 Tornberg, Jonas

T1 The urban economy as a scale-free network

YR 2003

JF Physica A: Statistical Mechanics and its Applications

SN 0378-4371

VO 345

IS 1

SP 227

OP 244

AB 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.

LA eng

OL 30