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Measuring the concentration of urban population in the negative exponential model using the Lorenz curve, Gini coefficient, Hoover dissimilarity index, and relative entropy

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  • Joel E. Cohen

    (Rockefeller University)

Abstract

Background: Stewart (1947) and Clark (1951) proposed that urban population density is a negative exponential function of the distance from a city’s center. This model of the spatial distribution of urban population density has been influential in urban economics, transportation planning, and urban demography. Duncan (1957) suggested characterizing the inequality in the distribution of urban population density in this model by using standard economic measures of concentration or unevenness: the Lorenz curve, the Gini coefficient, and the Hoover dissimilarity index. Batty (1974) advocated measuring concentration using relative entropy. Objective: We execute Duncan’s (1957) and Batty’s (1974) suggestions using mathematical analysis, not simulations. Methods: We modify the negative exponential model to recognize that any city has a finite radius. Results: Mathematical analysis reveals that all four measures of concentration depend sensitively on the finite radius of the city in the negative exponential model. We give a numerical example of the sensitivity of the concentration measures to the boundary radius. Contribution: In empirical applications of the negative exponential model of urban population density, it is important to have clear, consistent standards for defining urban boundaries. Otherwise, differences between cities or over time within the same city in these four and perhaps other measures of concentration could be due at least in part to differences in defining the radius or other boundaries of the city.

Suggested Citation

  • Joel E. Cohen, 2021. "Measuring the concentration of urban population in the negative exponential model using the Lorenz curve, Gini coefficient, Hoover dissimilarity index, and relative entropy," Demographic Research, Max Planck Institute for Demographic Research, Rostock, Germany, vol. 44(49), pages 1165-1184.
    • Handle: RePEc:dem:demres:v:44:y:2021:i:49
    DOI: 10.4054/DemRes.2021.44.49
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    References listed on IDEAS

    as
    1. Douglas Massey & Jonathan Tannen, 2015. "A Research Note on Trends in Black Hypersegregation," Demography, Springer;Population Association of America (PAA), vol. 52(3), pages 1025-1034, June.
    2. McDonald, John F., 1989. "Econometric studies of urban population density: A survey," Journal of Urban Economics, Elsevier, vol. 26(3), pages 361-385, November.
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    More about this item

    Keywords

    inequalities; Clark's exponential model; density; Gini coefficient; Hoover index; Lorenz curve; population concentration; spatial distribution; urban population;
    All these keywords.

    JEL classification:

    • J1 - Labor and Demographic Economics - - Demographic Economics
    • Z0 - Other Special Topics - - General

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