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Representing links between a number of countries, using an association submodel

Model : country_links1
Simile version : 3.1+
Date added : 2003-06-20
Keywords : Association submodel ;

Description

This model is an example of setting up an association between objects using a data file. The file consists of pairs of IDs, with each pair specifying one instnace of the association.

In this case, we specify which countries share a trading association (i.e. which country can export to another country). The data file which specifies the country trading pairs also contains information on the volume of trade between each country pair. This is totalled for both the exporting country and the importing country.

This model is not much use by itself. Rather, it is meant to show how to handle one aspect of a larger model, which would probably incorporate dynamic production and utilisation of goods within the individual countries.

Files

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country_links1.sml

Diagram

Equations

View the model equations.

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