Abstract
By using census data from 1835 to 2005, this chapter studies the urban hierarchy in Colombia and its regions. The chapter focuses on three issues: firstly, the city size distribution by means of Zipf’s law and Gibrat’s law; secondly, evolution in the population growth models; and, thirdly, the empirical validation of the point made by Gabaix (Q J Econ 114(3):739–767, 1999b) on the coincidence between national and regional population patterns. Using the adjusted rank–size relationship and non-parametric techniques, we find that city size distributions follow Zipf’s power law, and also that Gibrat’s law holds at the national level and partially for the regions over the second half of the twentieth century. These results are consistent with changes in the population growth model from the mid-fifties at national and regional levels.
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Notes
- 1.
- 2.
Duranton (2006, 2007) develops a mechanism through which the agglomeration of firms is related to Zipf’s law. The argument is based on the proportional relationship between migration and the quantity of goods produced in a city or region, and also the relationship between investment in innovation and the number of firms. Under this scenario, small and discreet innovations will result in proportional population growth which, in turn, generates a Pareto distribution.
- 3.
The mechanism through which the deterministic growth model is related to the quality of life is given by the relationship between the agglomeration and the cities’ growth. The agglomeration of firms within particular cities or regions implies positive effects on income and employment.
- 4.
Almost half of the territory, the southeast of Colombia has historically been occupied by rain forest and jungle, where only about 4% of the population lives.
- 5.
This expression indicates that it is possible to empirically estimate, through a linear regression, the coefficient a, from which we can then derive whether or not the Zipf’s law holds.
- 6.
In this case, if the growth of all cities is proportional, such as predicted by Gibrat’s law, the straight line with slope equal to 1 predicted by Zipf’s Law should move in a parallel fashion (Goerlich and Mas 2010).
- 7.
- 8.
Härdle (1990) presents a detailed description on the computation of non-parametric estimates of the mean and variance.
- 9.
In order to confirm the robustness of the results with respect to different bandwidths, additional exercises were carried out using the Silverman’s (1986) optimal bandwidth and similar results were found. For Germany, Giesen and Südekum (2011) also found, in a similar exercise, similar results using these two bandwidths.
- 10.
Other administrative units are the metropolitan areas. However, in Colombia they are only 10.
- 11.
- 12.
In Colombia in 2015, approximately 76% of the population was living in the urban areas.
- 13.
In order to test the robustness of the results, two alternatives were also used: those including the municipalities within 90 and 95 percentiles of the population distribution. The results were similar in magnitude and significance.
- 14.
An arbitrary city size is taken in order to facilitate visualization of changes in the number and size of cities over time.
- 15.
- 16.
Notice, for instance, that in the Caribbean region Zipf’s Law began to hold before it did in the other regions. Although this chapter does not pretend to answer the question why this is so, one possible explanation is that, historically, this region was one of the first to be populated, mainly due to its importance as a seaport and a “hot spot” for international trade.
- 17.
The results are only given for this particular period because for all regions and for the rest of the series the hypotheses of constant means and variances were rejected. Additionally, it is of major interest to check the results for Gibrat’s and Zipf’s laws only for the periods where the latter law holds.
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A Spanish version of this research was published in Revista de Historia Económica/Journal of Iberian and Latin American Economic History (New Series), Volume 32/Issue 02/September 2014, pp 247–286.
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Appendices
Appendix 1
Descriptive statistics of the Colombian cities, 1835–2005 (Municipalities representing 100% of the population)
Year | Number of cities | Mean | Standard deviation | Median | Minimum size | Maximum size | Gini index |
---|---|---|---|---|---|---|---|
1835 | 749 | 2.070 | 2.270 | 1.512 | 34 | 39.442 | 0.468 |
1843 | 751 | 2.360 | 2.355 | 1.846 | 63 | 40.086 | 0.445 |
1851 | 802 | 2.617 | 2.461 | 2.010 | 37 | 29.649 | 0.459 |
1870 | 739 | 3.624 | 3.045 | 2.845 | 58 | 40.883 | 0.392 |
1905 | 762 | 5.616 | 6.004 | 4.175 | 97 | 100.000 | 0.423 |
1912 | 767 | 6.486 | 6.759 | 5.054 | 33 | 121.257 | 0.387 |
1918 | 806 | 7.056 | 7.955 | 5.408 | 160 | 143.994 | 0.411 |
1938 | 809 | 10.745 | 17.079 | 7.309 | 399 | 355.502 | 0.442 |
1951 | 827 | 13.944 | 33.148 | 8.330 | 347 | 715.250 | 0.508 |
1964 | 879 | 19.875 | 71.058 | 10.093 | 294 | 1.697.311 | 0.581 |
1973 | 1020 | 22.403 | 106.622 | 10.118 | 85 | 2.861.913 | 0.635 |
1985 | 1024 | 29.352 | 153.862 | 12.000 | 797 | 4.236.490 | 0.669 |
1993 | 1061 | 31.206 | 175.391 | 11.343 | 78 | 4.945.448 | 0.701 |
2005 | 1113 | 38.524 | 233.820 | 12.626 | 225 | 6.840.116 | 0.726 |
Appendix 2
Descriptive statistics of the Colombian regions, 1835–2005 (Municipalities representing 100% of the population)
Year | Number of cities | Mean | Standard deviation | Median | Minimum size | Maximum size | Gini index |
---|---|---|---|---|---|---|---|
(a) Caribbean region | |||||||
1835 | 182 | 1.236 | 1.480 | 765 | 74 | 11.929 | 0.512 |
1843 | 187 | 1.269 | 1.416 | 761 | 70 | 10.145 | 0.497 |
1851 | 189 | 1.344 | 1.475 | 791 | 93 | 9.896 | 0.498 |
1870 | 126 | 2.595 | 2.051 | 1.950 | 390 | 11.595 | 0.387 |
1905 | 145 | 3.641 | 4.466 | 2.506 | 97 | 40.115 | 0.462 |
1912 | 118 | 6.277 | 6.270 | 4.473 | 184 | 48.907 | 0.403 |
1918 | 119 | 7.018 | 8.202 | 4.472 | 726 | 64.543 | 0.448 |
1938 | 113 | 12.707 | 17.967 | 8.177 | 1.412 | 152.348 | 0.481 |
1951 | 117 | 16.541 | 29.526 | 10.663 | 1.970 | 283.238 | 0.512 |
1964 | 128 | 25.490 | 50.441 | 14.614 | 2.318 | 498.301 | 0.535 |
1973 | 161 | 28.693 | 64.513 | 15.206 | 2.624 | 703.488 | 0.562 |
1985 | 161 | 38.933 | 89.988 | 18.962 | 3.676 | 927.233 | 0.580 |
1993 | 162 | 42.404 | 99.832 | 19.631 | 3.840 | 993.759 | 0.595 |
2005 | 194 | 46.861 | 117.517 | 19.065 | 2.721 | 1.146.498 | 0.628 |
(b) Central region | |||||||
1835 | 127 | 2.300 | 1.895 | 1.911 | 79 | 10.280 | 0.418 |
1843 | 135 | 2.661 | 1.887 | 2.276 | 66 | 9.118 | 0.370 |
1851 | 156 | 2.876 | 2.229 | 2.344 | 198 | 13.755 | 0.397 |
1870 | 159 | 3.949 | 3.258 | 3.336 | 281 | 29.765 | 0.388 |
1905 | 176 | 7.516 | 6.191 | 5.566 | 464 | 53.936 | 0.375 |
1912 | 184 | 8.257 | 7.109 | 6.396 | 547 | 71.004 | 0.368 |
1918 | 203 | 8.665 | 7.896 | 6.454 | 276 | 79.146 | 0.390 |
1938 | 211 | 13.004 | 14.809 | 9.755 | 474 | 168.266 | 0.408 |
1951 | 217 | 16.970 | 28.290 | 11.615 | 1.255 | 363.865 | 0.461 |
1964 | 236 | 22.435 | 55.056 | 13.303 | 2.297 | 772.887 | 0.526 |
1973 | 270 | 23.692 | 75.289 | 12.897 | 918 | 1.163.868 | 0.566 |
1985 | 273 | 29.656 | 96.443 | 14.922 | 2.005 | 1.480.382 | 0.593 |
1993 | 273 | 31.748 | 107.418 | 14.858 | 2.329 | 1.630.009 | 0.623 |
2005 | 278 | 39.136 | 143.948 | 16.079 | 2.690 | 2.214.494 | 0.663 |
(c) Eastern region | |||||||
1835 | 315 | 2.590 | 2.813 | 2.006 | 71 | 39.442 | 0.425 |
1843 | 306 | 2.923 | 2.891 | 2.454 | 63 | 40.086 | 0.399 |
1851 | 321 | 3.338 | 2.847 | 2.766 | 51 | 29.649 | 0.407 |
1870 | 314 | 4.174 | 3.358 | 3.446 | 58 | 40.883 | 0.362 |
1905 | 322 | 5.350 | 6.268 | 4.280 | 262 | 100.000 | 0.379 |
1912 | 323 | 5.870 | 7.261 | 4.732 | 567 | 121.257 | 0.359 |
1918 | 324 | 6.555 | 8.618 | 5.163 | 524 | 143.994 | 0.373 |
1938 | 334 | 8.656 | 19.937 | 6.111 | 681 | 355.502 | 0.428 |
1951 | 336 | 10.666 | 39.638 | 6.379 | 785 | 715.250 | 0.500 |
1964 | 345 | 15.937 | 92.455 | 7.396 | 965 | 1.697.311 | 0.615 |
1973 | 383 | 19.140 | 147.547 | 7.029 | 833 | 2.861.913 | 0.691 |
1985 | 384 | 25.672 | 217.821 | 7.767 | 797 | 4.236.490 | 0.743 |
1993 | 391 | 28.064 | 252.483 | 6.982 | 270 | 4.945.448 | 0.786 |
2005 | 396 | 36.264 | 346.825 | 7.503 | 885 | 6.840.116 | 0.822 |
(d) Pacific region | |||||||
1835 | 98 | 2.067 | 1.546 | 1.675 | 156 | 8.173 | 0.389 |
1843 | 94 | 2.782 | 1.832 | 2.320 | 179 | 10.376 | 0.335 |
1851 | 103 | 2.948 | 2.080 | 2.377 | 199 | 11.848 | 0.359 |
1870 | 130 | 3.059 | 2.423 | 2.176 | 480 | 12.743 | 0.391 |
1905 | 107 | 6.481 | 5.888 | 4.656 | 325 | 30.835 | 0.414 |
1912 | 118 | 6.669 | 4.893 | 5.272 | 938 | 27.760 | 0.351 |
1918 | 127 | 7.247 | 6.128 | 5.634 | 261 | 45.525 | 0.379 |
1938 | 131 | 11.804 | 11.393 | 9.209 | 1.109 | 101.883 | 0.391 |
1951 | 136 | 16.388 | 26.951 | 10.184 | 954 | 284.186 | 0.485 |
1964 | 141 | 22.892 | 55.991 | 13.374 | 2.149 | 637.929 | 0.544 |
1973 | 153 | 27.733 | 82.912 | 13.040 | 1.938 | 991.549 | 0.593 |
1985 | 153 | 34.534 | 119.513 | 14.119 | 3.661 | 1.429.026 | 0.643 |
1993 | 163 | 36.422 | 134.530 | 15.329 | 2.063 | 1.666.468 | 0.648 |
2005 | 177 | 41.955 | 165.143 | 15.696 | 3.481 | 2.119.843 | 0.672 |
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Pérez-Valbuena, G.J., Meisel-Roca, A. (2020). City Size Distribution in Colombia and Its Regions, 1835–2005. In: Poot, J., Roskruge, M. (eds) Population Change and Impacts in Asia and the Pacific. New Frontiers in Regional Science: Asian Perspectives, vol 30. Springer, Singapore. https://doi.org/10.1007/978-981-10-0230-4_3
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