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Article

Economics of Rural–Urban Migration  

Pei-Ju Liao and Chong Kee Yip

In the past century, many developing countries have experienced rapid economic development, which is usually associated with a process of structural transformation and urbanization. Rural–urban migration, shifting the labor force from less productive agricultural sectors to more productive industrial sectors in cities, plays an important role in the growth process and thus has drawn economists’ attention. For instance, it is recognized that one of the important sources of China’s growth miracle is rural–urban migration. At the early stage of economic development, an economy usually relies on labor-intensive industries for growth. Rural–urban migrants thus provide the necessary labor force to urban production. Since they are more productive in industrial sectors than in agricultural sectors, aggregate output increases and economic growth accelerates. In addition, abundant migrants affect the rates of return to capital by changing the capital–labor ratio. They also change the skill composition of the urban labor force and hence the relative wage of skilled to unskilled workers. Therefore, rural–urban migration has wide impacts on growth and income distribution of the macroeconomy. What are the forces that drive rural–urban migration? It is well understood that cities attract rural migrants because of better job opportunities, better career prospects, and higher wages. Moreover, enjoying better social benefits such as better medical care in cities is another pull factor that initiates rural–urban migration. Finally, agricultural land scarcity in the countryside plays an important role on the push side for moving labor to cities. The aforementioned driving forces of rural–urban migration are work-based. However, rural–urban migration could be education-based, which is rarely discussed in the literature. In the past decade, it has been proposed that cities are the places for accumulating human capital in work. It is also well established that most of the high-quality education institutions (including universities and specialized schools for art and music) are located in urban areas. A youth may first move to the city to attend college and then stay there for work after graduation. From this point of view, work-based migration does not paint the whole picture of rural–urban migration. In this article, we propose a balanced view that both the work-based and education-based channels are important to rural–urban migration. The migration story could be misleading if any of them is ignored.

Article

Urbanization and Emerging Cities: Infrastructure and Housing  

Gilles Duranton and Anthony J. Venables

Urbanization is a central challenge of our times. At its core, it is an urban development challenge that requires addressing transportation and housing in cities. Transport improvements can reduce travel times and improve the spatial reach of urban dwellers. But these improvements may be crowded out by latent demand for travel and may lead to worse congestion, pollution, and other negative externalities associated with urban traffic. To evaluate the effects of transport improvements, direct travel effects must be measured. Then, an improvement in traffic conditions somewhere may spill over to other areas. Firms and residents may also relocate, so economic growth close to a transport improvement may just result from a displacement of economic activity from other areas. Conversely, better accessibility is expected to foster agglomeration effects and increase productivity. Valuing these changes is difficult, as it requires being able to quantify many externalities such as congestion delays, scheduling gains, and greater job accessibility. Housing policies present different challenges. More fundamental policies seek to enable housing construction by offering more secure property rights, up-to-date land registries, and competent land-use planning—all complex endeavors and all necessary. Other housing policies rely on heavy government interventions to provide housing directly to large segments of the urban population. These policies often flop because governments fail to link housing provision with job accessibility and appropriate land-use planning. Housing is also an expensive asset that requires significant initial funding, while credit constraints abound in the urbanizing world. Policymakers also need to choose between small improvements to extremely low-quality informal housing, retrofitting modern housing in already-built urban areas, or urban expansion. All these options involve sharp trade-offs, subtle induced effects, and complex interactions with transport. All these effects are difficult to measure and challenging to value.

Article

Urbanization in Argentina, 16th to 19th Centuries  

Melisa Pesoa

The urbanization process in Argentina began with the installation of the first permanent settlement in the territory in 1527. During the early colonial period, settlers tried to move inland rather than establish towns on the Atlantic coast. Therefore, the main axis of urbanization strengthened the connection between the central zone with Alto Peru, reinforcing part of the existing indigenous territorial connection. Colonial cities, established by small groups of between twenty and fifty people, such as Santa Fe, Santiago del Estero, Córdoba, and Mendoza, established relations with the territories of Chile, Peru, and Paraguay. Indigenous resistance to colonization was powerful: several cities from the colonial era were not successful and needed to be moved or disappeared. Other experiences such as the Jesuit missions emerged as other models of colonization aside from the traditional one. In this territorial scheme, the coastal region was marginalized from the central nucleus. The ports of the coast and of Buenos Aires fulfilled a defensive military function, although they also served illicit traffic between the Atlantic and Potosí. However, this traffic increased over time, and Buenos Aires progressively gained importance. In 1776, Buenos Aires became the capital of the recently created Viceroyalty of the Rio de La Plata, as a result of the Bourbon reforms. Therefore, during the 18th century, its port was legally opened to overseas traffic, and its hinterland was incorporated into world trade. This initiated a change in the region’s center of gravity, which moved from the interior to the River Plate coast. In this period, the Crown’s interest shifted from the establishment of an imperial structure to securing the marginal areas of the empire through permanent populations with a plan of new settlements in the frontier. This interest remained even after the Independence from the Spanish Crown (1816), in the Republican period. During the 19th century, hundreds of towns were established across the territory, mainly focused on agricultural production or extractive activities. A series of highly important technical advances reached the country. The most relevant was the railway, built at the end of the 1850s and systematically extended from the 1870s. Its installation structured the territory and encouraged the creation of urban centers mainly in the central area of the Pampas. However, further types of colonization emerged related to products such as sugar or yerba mate in other regions of the country. Traditional colonial urban centers, converted into provincial capitals, started several reforms during the 19th century in order to adapt to the changes proposed by this new territorial structure and the new republican spirit. European immigration played a preponderant role in the country’s urban and productive development. The greater availability of workers, in addition to many other economic development actions, contributed to considerably increasing agricultural exports from the 1870s and positioned Argentina among the largest exporters of raw materials worldwide. The resulting system of urbanization had far-reaching consequences for the general functioning of the country in the following centuries.

Article

White Internal Migration to American Cities, 1940–1980  

Chad Berry

An overview of Euro-American internal migration in the United States between 1940 and 1980 explores the overall population movement away from rural areas to cities and suburban areas. Although focused on white Americans and their migrations, there are similarities to the Great Migration of African Americans, who continued to move out of the South during the mid-20th century. In the early period, the industrial areas in the North and West attracted most of the migrants. Mobilization for World War II loosened rural dwellers who were long kept in place by low wages, political disfranchisement, and low educational attainment. The war also attracted significant numbers of women to urban centers in the North and West. After the war, migration increased, enticing white Americans to become not just less rural but also increasingly suburban. The growth of suburbs throughout the country was prompted by racial segregation in housing that made many suburban areas white and earmarked many urban areas for people of color. The result was incredible growth in suburbia: from 22 million living in those areas in 1940 to triple that in 1970. Later in the period, as the Steelbelt rusted, the rise of the West as a migration magnet was spurred by development strategies, federal investment in infrastructure, and military bases. Sunbelt areas were making investments that stood ready to recruit industries and of course people, especially from Rustbelt areas in the North. By the dawn of the 21st century, half of the American population resided in suburbs.

Article

The Emerging Environmental Economic Implications of the Urban Water–Energy–Food (WEF) Nexus: Water Reclamation with Resource Recovery in China, India, and Europe  

Daphne Gondhalekar, Hong-Ying Hu, Zhuo Chen, Shresth Tayal, Maksud Bekchanov, Johannes Sauer, Maria Vrachioli, Mohammed Al-Azzawi, Hannah Patalong, Hans-Dietrich Uhl, Martin Grambow, and Jörg E. Drewes

With economic and population growth, industrialization, urbanization, and globalization, demand for natural resources such as water, energy, and food continues to increase, particularly in cities. Overconsumption of resources has led to degradation of the environment, a process that is interacting with and is further accelerated by a dangerous alteration to the climate. Fast growing cities worldwide already face severe technical difficulties in providing adequate infrastructure and basic services in terms of water and energy. This situation is set to become increasingly difficult with climate change impacts. The latter are increasingly affecting economically developing as well as developed countries. However, cities often have limited capacities to take comprehensive climate action. Hence, practicable, scalable, and adaptable solutions that can systematically target key entry points in cities are needed. The Water-Energy-Food (WEF) Nexus concept is one potential integrated urban planning approach offering cities a more sustainable development pathway. Within this concept, urban water reclamation with resource recovery offers a key potential: reclaimed products such as water, bioenergy, nutrients, and others are valuable resources for which markets are emerging. Reclaiming water can also reduce stress on natural resources and support the prevention of environmental pollution. Thus, it can support water, energy, and food security and the achievement of the United Nations Sustainable Development Goals. However, so far there are few implemented examples of urban water reclamation with resource recovery at urban scales. Examples of good practice in cities in China, India, and Europe highlight key enablers and barriers to the operationalization of water reclamation with resource recovery and implications in terms of environmental economics relevant for cities worldwide. These findings can support a systemic sociotechnical transition to a circular economy.

Article

Urban Development and Environmental Degradation  

Wayne C. Zipperer, Robert Northrop, and Michael Andreu

At the beginning of the 21st century more than 50% of the world’s population lived in cities. By 2050, this percentage will exceed 60%, with the majority of growth occurring in Asia and Africa. As of 2020 there are 31 megacities, cities whose population exceeds 10 million, and 987 smaller cities whose populations are greater than 500 thousand but less than 5 million in the world. By 2030 there will be more than 41 megacities and 1290 smaller cities. However, not all cities are growing. In fact, shrinking cities, those whose populations are declining, occur throughout the world. Factors contributing to population decline include changes in the economy, low fertility rates, and catastrophic events. Population growth places extraordinary demand for natural resources and exceptional stress on natural systems. For example, over 13 million hectares of forest land are converted to agriculture, urban land use, and industrial forestry annually. This deforestation significantly affects both hydrologic systems and territorial habitats. Hydrologically, urbanization creates a condition called urban stream syndrome. The increase in storm runoff, caused by urbanization through the addition of impervious surfaces, alters stream flow, morphology, temperature, and water quantity and quality. In addition, leaky sewer lines and septic systems as well as the lack of sanitation systems contribute significant amounts of nutrients and organic contaminants such as pharmaceuticals, caffeine, and detergents. Ecologically, these stressors and contaminants significantly affect aquatic flora and fauna. Habitat loss is the greatest threat to biodiversity. Urbanization not only destroys and fragments habitats but also alters the environment itself. For example, deforestation and fragmentation of forest lands lead to the degradation and loss of forest interior habitat as well as creating forest edge habitat. These changes shift species composition and abundance from urban avoiders to urban dwellers. In addition, roads and other urban features isolate populations causing local extinctions, limit dispersal among populations, increase mortality rates, and aid in the movement of invasive species. Cities often have higher ambient temperatures than rural areas, a phenomenon called the urban heat island effect. The urban heat island effect alters precipitation patterns, increases ozone production (especially during the summer), modifies biogeochemical processes, and causes stresses on humans and native species. The negative effect of the expansion and urbanization itself can be minimized through proper planning and design. Planning with nature is not new but it has only recently been recognized that human survival is predicated on coexisting with biodiversity and native communities. How and if cities apply recommendations for sustainability depends entirely on the people themselves.

Article

Decision-Making in a Water Crisis: Lessons From the Cape Town Drought for Urban Water Policy  

Johanna Brühl, Leonard le Roux, Martine Visser, and Gunnar Köhlin

The water crisis that gripped Cape Town over the 2016–2018 period gained global attention. For a brief period of time in early 2018, it looked as if the legislative capital of South Africa would become the first major city in the world to run out of water. The case of Cape Town has broad implications for how we think about water management in a rapidly urbanizing world. Cities in the global South, especially, where often under-capacitated urban utilities need to cope with rapid demographic changes, climate change, and numerous competing demands on their tight budgets, can learn from Cape Town’s experience. The case of Cape Town draws attention to the types of decisions policymakers and water utilities face in times of crisis. It illustrates how these decisions, while being unavoidable in the short term, are often sub-optimal in the long run. The Cape Town drought highlights the importance of infrastructure diversification, better groundwater management, and communication and information transparency to build trust with the public. It also shows what governance and institutional changes need to be made to ensure long-term water security and efficient water management. The implementation of all of these policies needs to address the increased variability of water supplies due to increasingly erratic rainfall and rapidly growing urban populations in many countries. This necessitates a long-term planning horizon.

Article

Responses to Environmental Change  

Lisa Reyes Mason, Susan P. Kemp, Lawrence A. Palinkas, and Amy Krings

Communities worldwide are facing environmental crises such as air pollution, water shortages, climate change, and other forms of environmental change and degradation. While technical solutions for environmental change are essential, so too are solutions that consider social acceptability, value cultural relevance, and prioritize equity and social justice. Social work has a critical and urgent role in creating and implementing macrolevel social responses to environmental change. The key concepts of environmental change, environmental and ecological justice, social vulnerability, and social responses are discussed. A description of the roles and skills unique to macro social workers for this effort is given, followed by examples of macrolevel strategies and interventions. Opportunities and directions for future social work responses to a changing environment are identified.

Article

Populist Politics in Africa  

Danielle Resnick

Although widely used in reference to the Americas and Europe, the concept of populism has been less frequently applied to political dynamics in sub-Saharan Africa. Populism is variously viewed as a political strategy aimed at fostering direct links between a leader and the masses, an ideational concept that relies on discourses that conjure a corrupt elite and the pure people, and a set of socio-cultural performances characterized by a leader’s charisma, theatrics, and transgression of accepted norms. A cumulative approach that combines all three perspectives allows for identifying episodes of populism in Africa. These include historical cases of populist regimes in the 1980s as well as more contemporary examples of party leaders in the region’s democracies who use populism in their electoral campaigns to mobilize subaltern groups, especially those living in urban areas. As found in other regions of the world, those African leaders who have ascended to the presidency on the back of populism typically exert anti-democratic practices once in office. This reaffirms that populism can allow for greater representation of the poor and marginalized in the electoral process, but that populists’ celebration of popular will and supposedly unmediated ties to the people become convenient justifications for bypassing established institutions and undermining the rule of law.

Article

Cultural Representations of Nineteenth-Century Prostitution  

Per Jorgen Ystehede and May-Len Skilbrei

Paradoxically, in the 19th century, an era very concerned with public virtue, prostitutes were increasing being represented in Western European cultural expressions. Prostitution was a prevalent social phenomenon due to the rapid urbanization of Western Europe. People were on the move as both urban and rural areas underwent considerable material and normative change; the majority of Western European cities grew rapidly and were marked by harsh working and living conditions, as well as unemployment and poverty. A seeming rise in prostitution was one of the results of these developments, but its centrality in culture cannot be explained by this fact alone. Prostitution also came to epitomize broader social ills associated with industrialization and urbanization: “the prostitute” became the discursive embodiment of the discontent of modernity. The surge in cultural representation of prostitutes may also be seen as an expression of changing norms and a driver for change in the public perception of prostitution. In particular, artists came to employ the prostitute as a motif, revealing contemporary hypocrisy about gender and class.

Article

Port Cities and Islamic Insurgency across Southeast Asia, 1850–1913  

Joshua Gedacht

Port cities have long played a critical role in the circulation of peoples, commodities, and ideas within and across the maritime spaces of Southeast Asia. Although an indelible component of the islands and archipelagos of this region since at least the 15th century, the rise of global empires in the 19th century rejuvenated these communities by the sea, giving rise to thriving metropolises from Rangoon to Singapore, Bangkok to Penang. Historians recognize that these ascendant cities served as “imperial bridgeheads,” connecting the products and peoples of the Southeast Asian hinterlands to world markets. Yet, the idea of “cosmopolitanism” arguably pervades how historians understand these port cities; bustling docks, diverse populations, and lively scenes of popular culture take precedence over the imperial coercion unfolding within and beyond their shores. Port cities and urbanization, in fact, were intimately intertwined with the violence of conquest and Islamic insurgency enveloping various corners of the Southeast Asian countryside. When armed conflicts such as the bitter Dutch-Aceh War in the Netherlands East Indies (present-day Indonesia) and the Moro Wars in the southern Philippines engulfed venerable Muslim sultanates, the maritime metropolises of the Straits Settlements emerged as critical nodes—sites for the dissemination of weapons and smugglers, spies and diplomats, contentious ideas and theologies. These circulations were facilitated not just by Muslim networks or colonial agents but by the very cosmopolitan nature of port cities. Chinese and German, Arab and Turkish, Muslim and Christian, all became drawn into the whirling vortex of “Islamic insurgencies.” By highlighting the integral position of port cities in the conduct of various armed conflicts, it becomes possible to gain new perspectives and suggest reconfigured research paradigms for understanding the connected histories of colonial conquest.

Article

Archaeology of Bénin  

Inga Merkyte

The archaeology of Bénin, despite being a young discipline, presents a history of research and historical circumstances that have shaped the country. Reviewing the highly varied climatic and natural conditions casts light on human adaptation and management of the resources in the past, current preservation conditions, and potential pitfalls for archaeological practice in the country. Yet unresolved issues, such as research anomalies rather than objectively conditioned historical realities, remain. Using information from three “weather stations”—the most substantial archaeological research projects carried out by the international teams in northern, northwestern, and southern Bénin—an attempt of a short yet comprehensive reconstruction of Bénin’s past can be delivered.

Article

Women and Migration in Africa  

Lesley Nicole Braun

African women’s experiences of migration and transregional movements have long been eclipsed by men’s histories of travel and journeying. However, this certainly does not mean that women have not historically participated in geographical movement, both with their families and independently. Reasons for women’s migratory practices are divergent, and they are informed by a kaleidoscope of shifting historical internal and external sociopolitical forces. Some of these include escape from violent conflict and war, slavery, environmental and economic hardship, and oppressive family constraints. The colonial era marked a period of intense migration in which men were forcibly moved to labor within extractive economies. Women, for their part, sometimes migrated without the approval of their own families, and against the colonial administration’s sanctions. Their experiences were shaped by struggles against all forms of patriarchal authority. As a result of changing demographics and social roles, the colonial city also assumed a reputation among colonials and Africans as a space of moral depravity motivated by consumer culture. Consequently, migrant women often faced stigma when they entered cities, and sometimes when they returned home. Women were attracted to towns and cities and what they came to represent—spaces where new opportunities could be explored. Opportunity came in the form of economic independence, marriage, romantic liaisons, and education. Most migrant women were confronted with being marginalized to the domestic sphere and informal sector. However, many women also acquired and honed their market acumen, amassing wealth which they often reinvested in family networks back in their natal villages, thus revealing circular modes of migration associated with multilocal networks.

Article

Industry, Commerce, and Urbanization in the United States, 1790–1870  

David Schley

The eighty years from 1790 to 1870 were marked by dramatic economic and demographic changes in the United States. Cities in this period grew faster than the country as a whole, drawing migrants from the countryside and immigrants from overseas. This dynamism stemmed from cities’ roles as spearheads of commercial change and sites of new forms of production. Internal improvements such as canals and railroads expanded urban hinterlands in the early republic, while urban institutions such as banks facilitated market exchange. Both of these worked to the advantage of urban manufacturers. By paying low wages to workers performing repetitive tasks, manufacturers enlarged the market for their products but also engendered opposition from a workforce internally divided along lines of sex and race, and at times slavery and freedom. The Civil War affirmed the legitimacy of wage labor and enhanced the power of corporations, setting the stage for the postwar growth of large-scale, mechanized industry.

Article

Architecture in 20th-Century Brazil  

Fernando Luiz Lara

Brazilian modern architecture was widely celebrated in the 1940s and 1950s as a tropical branch of Corbusian architecture. While there is truth and depth to the influence of Le Corbusier in Brazil, the architecture of this country is much more than simply an application of his principles to a warmer climate. Moreover, Brazilian 20th-century architecture cannot be defined only by a few decades in which their buildings coincided with and reinforce northern expectations. Many contemporary authors have explored the pervasive nature of such ethnocentrism in architectural history, which denies agency and initiative to anyone outside its intellectual borders. A more adequate analysis must give proper emphasis to Brazilian architects’ motivations and agency, exploring in their main buildings how they struggled to express themselves and their societal aspirations by skillfully manipulating a formal and spatial vocabulary of international modernity. A contemporary study of Brazilian 20th-century architecture would not be worthy of its title if it did not address similar double standards that have been applied domestically. It is paramount to understand that the influence of modernism in the built environment reached way beyond the well-known centers of Rio de Janeiro and São Paulo, and its manifestations go way beyond the high modernism of the 1940s and 50s. The ethnocentrism of the global North Atlantic repeats itself in Brazil, with the architectures of Rio de Janeiro and São Paulo overshadowing all others. If Brazilian architecture in general is not well known, notwithstanding its extraordinary achievements, still less known are the buildings erected in Recife, Porto Alegre, Belo Horizonte, and Salvador, to mention only four other major urban centers, or the hundreds of buildings in medium-size cities with as much quality and intentionality as those of Rio and São Paulo.

Article

Urbanization in East Africa, circa 900–2010 CE  

Andrew Burton

East Africa’s urban past is broken down into five historical periods. The first (c. 900–1500 ce) saw the emergence of an urban Swahili culture on the East African coast that flourished thanks to its role as economic and cultural arbiter between the African interior and the Indian Ocean world. Between 1500 and 1800, as in other parts of the world, the intrusion of Europeans (and other outsiders) appears to have had a detrimental impact on “classical” Swahili civilization, although several important urban centers continued to flourish. Inland there is negligible evidence of urbanization before 1800. From around this time, however, important settlements did arise in the interior, thanks largely to the region’s growing integration in an international economy that emerged in the course of the 19th century—with various coastal (Swahili) cities prospering once again through their intermediary role. The situation was transformed with the onset of European colonial rule (c. 1890–1960), which prompted historically unprecedented rates of urban growth and witnessed the emergence of what would become a number of important world cities. Toward the end of the colonial period, from the 1940s, East Africa’s urban centers experienced another upward jolt in their rates of growth; however, the full repercussions of this demographic revolution, which resulted in a substantial (and growing) proportion of the population claiming urban residence for the first time, did not become fully apparent until after independence; with rapid urbanization proving one of the most important features of postcolonial East Africa.

Article

Slavery in Luanda and Benguela  

Mariana P. Candido and Vanessa Oliveira

The institution of slavery existed in West Central Africa before the arrival of Europeans as a form of labor exploitation. While in local states political elites targeted outsiders and criminals as potential captives, slavery in the colonial settlements of Luanda and Benguela was similar to bondage in other Atlantic ports such as Rio de Janeiro, Havana, or Cartagena, and even in other colonial towns on the African coast including Cape Town and Lagos. Captives of war or people born into bondage performed most of the domestic and public labor. Their productive and reproductive capacities were appropriated for the benefit of their owners. Slaves could be bought and sold, were considered property, and did not enjoy rights, including to their own sexuality. Despite owners’ control, enslaved men and women resisted oppression and sought to ameliorate their condition and status through different strategies such as flight or paying for their own manumission. Slavery remained an important element of colonial societies in Luanda and Benguela until it was officially abolished in 1869, and new forms of compulsory labor were introduced.

Article

The History of Migrant Labor in South Africa (1800–2014)  

Peter Delius

A pervasive system of migrant labor played a fundamental part in shaping the past and present of South Africa’s economy and society and has left indelible marks on the wider region. South Africa was long infamous for its entrenched system of racial discrimination. But it is also unique in the extent to which urbanization, industrialization, and rural transformation have been molded by migrant labor. Migrancy and racism fed off each other for over a century, shaping the lives and deaths of millions of people.

Article

The Copperbelt of Zambia and the Democratic Republic of Congo  

Iva Peša

The Central African Copperbelt, a region which straddles the boundary between the Democratic Republic of Congo and Zambia, holds exceptionally rich and high-grade copper deposits. These deposits have been worked from as early as the 6th century ce. Still, the commencement of large-scale industrial resource extraction at the start of the 20th century, spurred by imperial rivalry between Belgian and British interests, initiated fundamental processes of change. The Copperbelt urbanized rapidly, as the mines attracted thousands of migrant workers from hundreds of miles away. The social, cultural, economic, and political lives of these new urbanites have attracted much attention from colonial administrators and mining officials, as well as from generations of social scientists and historians. These observers have tended to depict the Copperbelt’s history in terms of stark dichotomies, as part of a transition from rural to urban; from subsistence agriculture to industrial wage labor; from extended kinship to nuclear families; or even from “tradition” to “modernity.” The protracted economic crisis which held the Copperbelt in its sway between 1975 and 2000 painfully revealed the boom-and-bust nature of copper mining. This period of “decline” made scholars question earlier modernization frameworks. Examples showing how kinship ties have been creatively reworked, how gender roles have constantly been subject to negotiation, and how economic precarity was part of urban life throughout the 20th century, suggest that Copperbelt scholarship should abandon narratives of “transformation” and exceptionalism. The Central African Copperbelt, instead, exemplifies African history’s rich complexity.

Article

The Geography of World Cities  

Raymond J. Dezzani and Christopher Chase-Dunn

World cities are a product of the globalization of economic activity that has characterized post-World War II capitalism, and exhibit characteristics previously found in primate cities but with influence extending far beyond the range of the metropolitan state. They are the culmination of postwar urbanization mechanisms coupled with the rise of transnational corporations that have served to concentrate unprecedented population and economic power/potential. The potential for both human development advantage and disadvantage is historically unprecedented in these new and highly interconnected urban amalgams. In general, human settlement systems are usually understood to include the systemic (regularized) ways in which settlements (hamlets, villages, towns, cities) are linked with one another by trade and other kinds of human interaction. Geographers, historians, and economists have developed models of urban structure and patterning incorporating population location/movement and the location of economic activity to be able to rationally explain and predict urban growth and allocate resources so as to implement equitable distributions. The resulting models served to illustrate the importance of the interactions between specific geographic location, population concentrations, and economic activity. But given the development of world cities, there is the relationship between the size of settlements and political power in intergroup relations to consider. The spatial aspect of population density is, after all, one of the most fundamental variables for understanding the constraints and possibilities of human social organization.