Lidl wasn't far behind, coming out cheapest in the first five months of the year.Īcross the seven months that Aldi was awarded 'cheapest supermarket of the month', the average difference was £1.59 compared to Lidl.Īsda was the cheapest of the non-discounter supermarkets, coming out on top every month across 2022. The discounter was the cheapest supermarket in our analysis for seven out of 12 months in 2022, more than any other supermarket. Find out more: latest supermarket news from Which?Īs well as analysing prices each month, we do a whole-year look each January – and, according to our analysis, Aldi was the cheapest supermarket in 2022.We use experts to ensure that own-label products are as comparable as possible between the supermarkets, based on a range of factors including weight, quality and other industry data. We listened to that feedback and have added own-label items to our trolley to enable us to widen the net of retailers we include. Many Which? members told us that they would find it helpful to be able to see how the discounters compared with the mainstream supermarkets. However, the downside was that, as Aldi and Lidl primarily sell own-label items with just a small supplementary range of branded goods, they couldn’t be included. This had the advantage of ensuring that we were strictly comparing like with like. Why? We used to only include branded products in our trolley. How our research has changed to include Aldi and LidlĪt Which?, we’ve been analysing supermarket prices for years, but we only added Aldi and Lidl to our research in 2020. This means the trolley totals aren't comparable between months or years. We rotate the products in the trolley to ensure we're comparing as many branded products as possible. Most of this is based on online prices, but for Aldi and Lidl (which don't sell their full ranges online) we send fieldworkers out to stores to see how much each item costs each day. Our data is supplied by an independent price comparison company. The contents of our trolley vary from month to month and might include anything from Andrex toilet paper and Lurpak butter to own-label bread and Heinz baked beans. We include special offers, but not multibuys. We track the prices of up to 200 branded and own-label products every day over the course of a month to work out the average cost per item, then add those averages up to get a trolley total for each retailer. How do we work out which is the cheapest supermarket?
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