Two Essays on Alonso's Theory of Movement

Ledent, J. (1981). Two Essays on Alonso's Theory of Movement. IIASA Research Report (Reprint). IIASA, Laxenburg, Austria: RR-82-004. Reprinted from Sistemi Urbani, 2/3 [1980] and Environment and Planning A, 13 [1981].

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Abstract

First, it is shown that Alonso's general theory of movement relies on a standard doubly-constrained spatial interaction model. Such a finding then suggests the use of a biproportional adjustment method (RAS method) to adequately estimate the systemic variables specified in the underlying model. This eventually leads to the development of a complete and precise methodology for calibrating the Alonso model. This methodology is illustrated with the help of an application to data on interprovincial migration in Canada.

The second essay compares the system of equations underlying Alonso's theory of movement with that of Wilson's four standard models depending on the assumption at the outset about which of a total outflows and/or inflows are known. This result turns out to supersede earlier findings-inconsistent only in appearance-which were derived independently by Wilson and Ledent. In addition to this, an original contribution of this paper-obtained as a byproduct of the process leading to the aforementioned result-is to provide an exact methodology permitting one to solve the Alonso model for each possible choice of the input data.

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