3. IS THERE AN ORDER TO THIS?
Maybe it’s an
underlying
geometry in the
settlement
pattern…
4. IS THERE AN ORDER TO THIS?
Maybe all we
need to do is
rearrange the
cities slightly
to make the
pattern
apparent.
5. OBJECTIVE
• to understand the dynamics shaping the urban hierarchy
• what makes cities grow quickly or slowly?
• how do urban settlements of a particular size affect the
emergence and growth of other settlements of the same or
different size?
• what pattern would the system of settlements form in the
absence of complicating factors such as topography and
6. WHY ASK THESE QUESTIONS?
• to advance toward a more scientific understanding of
urbanization
• to develop a foundation on which to build a positivist
theory of urban growth
• to “raise” urban studies to the “level” of the hard
sciences--assuming the hard sciences are superior to the
soft (humanistic, descriptive, probabilistic) sciences
7. EVERY SCIENCE NEEDS A FORCE …
• economic competition
• between cities
• rational maximization
• by individuals
• friction of distance as a driving force
• cost distance
• time distance
• (later) cognitive distance
8. IN SHORT…
• Through rationally maximizing the productivity of their time…
• by minimizing the costs of various activities measured in
money and time,
• people collectively create a system in which facilities of all
sorts…
• including cities,
• are pitted against each other…
• and all facilities emerge from this competition in
advantageous locations and with predictable-sized areas of
dominance.
10. FOUNDERS OF CENTRAL PLACE
THEORY
• C.J. Galpin (1915)
• sociologist studying rural communities in Wisconsin
• decided that under ideal conditions settlements
would be spaced evenly
• pattern: overlapping circular service areas with the
central places aligned in a hexagonal array
• overlap of service areas indicates a region in which a
person is equally inclined to shop at either central
place
12. FOUNDERS OF CENTRAL
PLACE THEORY
• Walter Christaller (1966)
• assumption: each good has its particular
range and threshold
• threshold of a good: minimum size of market
capable of sustaining a business devoted to
that good
• range of a good: maximum distance a person
will be willing to travel to obtain that good
• associated assumptions
• variations in range and threshold from person
to person or from culture group to culture
group are irrelevant
• most people will shop at only one center
13. DETAILS OF
CHRISTALLER’S THEORY
• The vast range of retail functions could be grouped into
7 “orders,” corresponding to cities with different sized
hinterlands
• the functions in an order share a similar threshold and
range
• automobiles would be in a different order than loaves of
bread, for example
• What might be in the same order as automobiles?
• What might be in the same order as loaves of bread?
15. MORE TERMINOLOGY
• “Higher order” goods and services are those with a wider
range and higher threshold, located in larger urban
centers
• “Lower order” goods and services are those with a
narrower range and lower threshold, located in smaller
urban centers
• “break point”: the invisible boundary between markets of
competing central places
• “isotropic plain” uniform land surface on which these
ordering principles would generate a hexagonal pattern
of cities
16. AN INTERPRETATION OF THE URBAN
HIERARCHY (LISTED BY ORDER)
1. largest cities (all functions, highest to lowest)
2. large cities
3. small cities
4. larger towns
5. smaller towns
6. villages
7. hamlets (only the lowest order functions)
17. VARIATIONS ON THE BASIC
THEORY
• different patterns result from different values of k
• market optimizing, k=3 (minimizes total number of
settlements serving a region)
• traffic optimizing, k=4 (emerges by minimizing the road
lengths joining all adjacent centers)
• administration optimizing, k=7 (assumes lower-order
places must be contained in the administrative districts of
higher order places; can not be situated on the
breakpoint)
21. ADVANTAGE OF CENTRAL PLACE
THEORY
• Central place theory has a number of advantages. It allows
us to see how and why two places differ, and how and why
places differs from the model
• In very flat areas and in primitive societies, central place
theory has been fond to approximate reality.
• It has also been used extensively in rural planning, especially
in the key settlements plans
22. CRITICISMS OF CENTRAL PLACE
THEORY
• Isotropic plains do not exist
• People are not rational. Even using the limited assumptions
of the model there is preference in terms of shopping, and
increasingly, there is bulk shopping. Time or cost may be a
more useful measure than distance
• It is static and there is no explanation of how patterns
change
• It does not take into account specialty towns such as tourist
town
• In man cases chance has played a part in determining
settlement pattern. The model does not allow for this.
23. WHAT WOULD THIS INDICATE?
• Urban hierarchy’s regularity may not be caused by the random perturbation
of what would ideally be a step-wise function caused by competition
between cities
• Instead, it may be caused by the natural emergence of dominant (hub)
nodes within a dynamic network
