The Family Spending report includes information about the average weekly spend by age
of household person; the table is reproduced below. This average data spreads the total
expenditure across all households, irrespective of whether they ever purchase an item or
how many people are in the household, and so where average amounts are lower this
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could be because fewer people are purchasing the item, or because less is being spent
(which in itself could be related to many things, from a change in preference, to a change
in the number of people in the household or the amount of disposable income available).