Christopher Chase-Dunn
and
Andrew Jorgenson
Institute for Research on World-Systems
University of California, Riverside
Riverside, CA 92521
City
lights from satellite photographs.
A shorter
version of this article will appear in the Encyclopedia
of Population, Geoffrey McNicoll and Paul Demeny (eds.) Macmillan, 2003.
Systems of cities are human
interaction networks and their connections with the built and natural
environments. Logically, the study of city systems is a subcategory of the more
general topic of settlement systems.
Once humans began living in fairly permanent hamlets and villages it
became possible to study the interactions of these settlements with one another.
Settlements are rarely ever intelligible without knowing their relations with
the rural and nomadic populations that interact with them. Archaeologists and
ethnographers map out the ways in which human habitations are spread across
space, and this is a fundamental window on the lives of the people in all
social systems. The spatial aspect of
population density is perhaps the most fundamental variable for understanding
the constraints and possibilities of human social organization. The settlement
size distribution – the relative population sizes of the settlements within
a region-- is an important and easily ascertained aspect of all sedentary
social systems. And the functional differences among settlements are a
fundamental aspect of the division of labor that links households and
communities into larger polities and interpolity systems. The emergence of social hierarchies is often
related to size hierarchies of settlements. And the monumental architecture of
large settlements is related to the emergence of more hierarchical social
structures – complex chiefdoms and early states.
Uruk, built on
the floodplain between the Tigris and Euphrates Rivers about 5000 years ago,
was the first large settlement that we call a city. Other cities soon emerged on the floodplain and this first system
of cities emerged in a region that had already developed hierarchical
settlement systems based on complex chiefdoms. For seven centuries after the
emergence of Uruk, the Mesopotamian world-system was an interactive network of
city-states competing with one another for glory and for control of the
complicated transportation routes that linked the floodplain with the natural
resources of adjacent regions. The relationship between cities and states is a
fundamental aspect of all complex social systems. The political boundaries of
polities are rarely coterminous with the interaction networks in which
settlements are embedded, and so settlement systems must be studied internationally
in all social systems.
From Hans J. Nissen, The Early History of the Ancient Near East
(University of Chicago Press, 1988, p. 41.
Both cities and states got larger with the
development of social complexity, but they did not grow smoothly. Rather there
were cycles of growth and decline and sequences of uneven development in all
the regions of the world in which cities and states emerged. It was the
invention of new techniques of power and production that ultimately made
possible the more complex and hierarchical societies that emerged. The
processes of uneven development by which smaller and newer semiperipheral
settlements overcame and transformed larger and older ones has been a
fundamental aspect of social evolution since the invention of sedentary
life.
The role of city
systems in the reproduction and transformation of human social institutions has
been altered by the emergence and predominance of capitalist accumulation.
Whereas the most important cities of agrarian tributary states were primarily
centers of control and coordination for the extraction of labor and resources
from vast empires by means of institutionalized coercion, the most important
cities in the modern world have increasingly supplemented the coordination of
force with the manipulations of money and the production of commodities.
The long rise of capitalism was promoted
by semiperipheral capitalist city-states, usually maritime coordinators of
trade protected by naval power. The Italian city-states of Venice and Genoa are
perhaps the most famous of these, but the Phoenician city-states of the
Mediterranean exploited a similar interstitial niche within a larger system
dominated by tributary empires. The
niche pioneered by capitalist city-states expanded and became more predominant
in the guise of core capitalist nation-states in a series of transformations
from Venice and Genoa to the Dutch Republic (led by Amsterdam) and eventually
the Pax Britannica coordinated by the great world city of the nineteenth
century, London. Within London the functions mentioned above were spatially
separated: empire in Westminster and money in the City. In the twentieth
century hegemony of the United States these global functions became located in
separate cities (Washington, DC and New York).
The great wave of
globalization in the second half of the twentieth century has been heralded (and
protested) by the public as well as by social scientists as a new stage of
global capitalism with allegedly unique qualities based on new technologies of
communication and information processing. Some students of globalization claim
that they do not need to know anything about what happened before 1960 because
so much has changed that the past is entirely non-comparable with the
present. Most of the burgeoning
literature on global cities and the world city system joins this breathless
presentism. But claims about the uniqueness of contemporary globalization can
only be empirically evaluated by studying change over time and by comparing the
post-World War II wave of globalization with the great wave of international
trade and investment that occurred in the last decades of the nineteenth
century. All social systems have exhibited waves of spatial expansion and
intensification of large interaction networks followed by contractions. The
real question is which aspects of the most current wave are unique and which
are functional repetitions of earlier pulsations. Historical comparison is
essential for understanding the most recent incarnation of the system of world
cities.
According
to the theorists of global capitalism it was during the 1960’s that the
organization of economic activity entered a new period expressed by the altered
structure of the world economy: the dismantling of industrial centers in the
United States, Europe and Japan; accelerated industrialization of several Third
World nations; and increased internationalization of the financial industry
into a global network of transactions (Sassen 1991). With the emerging spatial organization of the new
international division of labor, John Friedmann identified a set of theses
known as the world city hypotheses concerning the contradictory
relations between production in the era of global management and political
determination of territorial interests (Friedmann 1986). Saskia Sassen and others have further
elaborated the global city hypotheses.
Global cities, it is argued, have acquired new functions beyond acting
as centers of international trade and banking. They have become: (1)
concentrated command points in the organization of the world-economy that use
advanced telecommunication facilities, (2) important centers for finance and
specialized producer service firms, (3) coordinators of state power, (4) sites
of innovative post-Fordist forms of industrialization and production, and (5)
markets for the products and innovations produced (Sassen 2001a, 2000, 1991;
Brenner 1998; Yeoh 1999; Hall 1996; Friedmann 1995). These structural shifts in the functioning of cities are argued
to have “impacted both the international economic activity and urban form where
major cities concentrate control over vast resources, while financial and
specialized service industries have restructured the urban social and economic
order” (Sassen 1991, pg 4). During the 1990’s New York has specialized in
equity trading, London in currency trading, and Tokyo in size of bank deposits (Slater 2000). Beaverstock, Smith and Taylor (1999)
use Sassen’s focus on producer services to classify 55 cities as alpha, beta
and/or gamma world cities based on the presence of accountancy, advertising, banking/finance and law firms. Peter Taylor and Jon Beaverstock are
co-directing the Globalization and World Cities Study Group and Network at
Loughborough University. Their website
is a valuable resource for the study of systems of world cities (http://www.lboro.ac.uk/gawc/).
The most important assertion in the global
cities literature is the idea that the global cities are cooperating
with each other more than the world cities did in earlier periods. The most
relevant earlier period is the Pax Britannica, especially the last
decades of the nineteenth century. If this hypothesis is correct the division
of labor and institutionalized cooperative linkages between contemporary New
York, London and Tokyo should be greater than were similar linkages between
London, Paris, Berlin and New York in the nineteenth century. Obviously communications technologies were
not as developed in the nineteenth century, though intercontinental telegraph
cables had already been laid, and Japan was not yet a core power in the
world-system. But the nature and strength of coordination among the world
cities of the nineteenth century needs to be examined in order to support the
hypothesis of greater contemporary integration that the global cities
literature assumes.
Another
important hypothesis of the global cities literature is based on Saskia
Sassen’s (1991) observations about class polarization and the casualization of
work within globalizing cities. The research of Gareth Stedman Jones on Irish
immigration into London’s East End in the nineteenth century (Jones n.d.) shows
that a somewhat similar process of peripheralization of the core was
occurring in the Pax Britannica.
Much of the research on the global city system is based on case
studies of particular cities that seek to identify the processes leading to
their emergence and positioning within the larger system (Baum 1997; Grosfoguel
1995; Todd 1995; Machimura 1992; Kowarick and de Mello 1986). Janet Abu-Lughod (1999) traces the
developmental histories of New York City, Chicago, and Los Angeles through
their upward mobility in the world city system. While these U.S. metropoles share similar characteristics with
other world cities, they have substantial differences in geography, original
economic functions, transportation, and political history to serve as
fascinating cases for comparative analyses of globalization.
With appropriate data, social network analysis can be a
valuable tool for studying the webs of flows and connections among cities,
including flows of capital, commodities, information, and people (Smith 2000;
Smith and Timberlake 1995). Network
analysis produces quantitative indicators of structural characteristics of
networks and of nodes (cities) within networks. For example, measures of network centrality are useful for
examining the hierarchical aspects of the world city system. Quantitative measurement of the structures
of connections and dominance relations among cities—whether these be based on
links to global commodity chains, international business, financial and
monetary transactions, or critical flows of information, can provide an
important window on change over time in the global urban hierarchy (Smith
2000:157). The data necessary for
analyzing the structure of the world city system are difficult to obtain
because most statistical information is aggregated at the national level rather
than at the city level. But researchers are making heroic efforts to locate
data on characteristics of and interactions among cities.
Using
airline passenger flows between the world’s leading cities for 1977-1997 Smith
and Timberlake (1998, 2001) offer evidence of change in the structure of the
world city system. These data estimate
the frequency of face-to-face contacts among corporate executives, government
officials, international financiers, and entrepreneurs that grease the wheels
of global production, finance, and commerce (Smith 2000). Among other findings, their results place
London, New York City, and Tokyo near the top and center of the global city
hierarchy, supporting Sassen’s views (Smith and Timberlake 1998). Further, while many core cities continue to
occupy central positions in the global hierarchy, network roles of other cities
have shifted during this time. Latin
American world cities have declined in their central positioning and strength
in network linkages, while Asian cities and secondary cities on the west coast
of the United States (Pacific Rim) have moved into more central positions
within the world city system (Smith and Timberlake 2001).
Settlement
systems continue to be a fundamental framework for the analysis of social
change. The gigacities in both core and semiperipheral countries, and the
amazing density of cities on most continents that is revealed by satellite
photos of city lights at night would seem to portend Isaac Asimov’s Trantor,
a planet entirely encased by a single steel-covered city. But the Earthly
settlement system may be soon facing sticky wickets that even Asimov did not
envision. If the reaction against twentieth century globalization is anywhere
near as tumultuous as was the reaction against nineteenth century globalization
we are in for a rough ride in the next decades. Whether or not the global
cities can keep solidarity among themselves is crucial to all of us, because no
one wants new World Wars under contemporary technological conditions. The global
village needs to invent mechanisms of integration that can transcend the
centrifugal forces that have revisited the modern system of cities frequently
in recent centuries.
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