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How do we calculate the Grocer 33?

The Grocer 33 is a weekly mystery shopping survey, tracking price, service and availability at the five leading grocery retailers: Asda, Morrisons, Sainsbury's, Tesco and Waitrose.

The charts (left) show the scores from this week's survey. But if you click on the relevant chart you can find out all the details: the products and the prices in this week's 33 list, as well as the promotion details; the stores visited by this week's mystery shoppers; and which products were out of stock. You can also track price and promotion history by product, category and retailer, and the site offers a wide range of superb and sophisticated analytical tools for online subscribers.

The scores from each week's 33 are also totted up, and an award is given out at the end of a 50-week period.

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