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The introduction of unit pricing in food stores makes it easier for shoppers to choose cheaper items. Low-income shoppers, however, do not appear to make significant use of unit pricing in contrast to the middle-income and high-income shoppers who do. The explanation could lie in their lower ability to understand the unit price labeling system making it difficult to capture the benefits of its use.
Isakson et al. (Wed,) studied this question.
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