A method for modelling relationships between a plurality of products sold by a retail outlet. Each product to be modelled is allocated to a category, such that a model is created containing a plurality of categories each containing a plurality of products. At least one product in each category is nominated to be a category flag product, and relationships between products within the same category are modelled. Relationships between two products allocated to different categories are modelled only if the two products are both category flag products.
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