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Weight of purchase refers to the number of products, or alternatively the amount of products (e.g. litres/grams), by a given household in a time period.

So if the average household buys a 500g pot of yoghurt 52 times a year, the average weight of purchase for yoghurt is 26kg a year.

Sometimes, average weight of purchase isn’t considered in a time period, but is instead looked at per visit to the supermarket – as the weight of purchase of items in a basket.