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Lecture 8

# Lecture 8 .docx

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Department
Geography
Course
GGR252H1
Professor
Stephen Swales
Semester
Winter

Description
 The Converse Breakpoint method make it possible to predict the point between two centres (E.g. Shopping centres) where the trading influence of each is equal, we can think of this point as the point or line of indifference (i.e. Where the utility of the two centres is equal). It sis also the market boundary between the centres.  The method uses distance and size to calculate the line of indifference (i.e. The market boundaries)  Converse Breakpoint Method o Dy= (Dxy) /( 1+ sqrt (Ax/Ay)) - In textbook o Dxy – distance btwn x and y o Ax – attraction to X/Y o Draw breakpoints at 90 degree angles Technique  The converse formula requires data aon distance between centres and size of centres. Together these two vairables are thought to adequently measure the reative utility of the centres. The formula suggests that the utility of the centre decreases with distance and increases with size  Size meansure could be : numbers of stores, square footage of the centre, number of employees, number of parking spaces, etc.  The formula calculates the distance of the breakpoint ( line of indifference) from the subject Centre Assumptions  Unlike the Theisson polygon method the converse method does not assume that all centres are equal in attractiveness (size). It does however have the other unifying assumptions evident in the Theisson method ( fully informed rational maximize)  Criticism  Again we will find possible weaknesses in the model in its unifying assumptions, to what extent does the “real world” meet these assumptions? Is a size measurement an effective surrogate measure of all aspects of image in attraction? What about the ambiance and design of the centres? 
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