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Lidl is cheaper than Walmart and Aldi.

Business Insider/Hayley Peterson

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The German supermarket chain Lidl just opened its first US stores last week, and it’s already dominating America’s largest grocer, Walmart, on prices.

Lidl is about 9% cheaper than Walmart, according to a price check on a basket of 20 items by Jefferies analysts.

The price check also revealed that Lidl is also 3% cheaper than its German rival Aldi and 16% cheaper than Food Lion.

This new competition will put added pressure on US grocers to lower their prices at a time when food deflation is already weighing down margins.

In addition to low prices, the Lidl store also offered a premium shopping experience with impressive customer service and an attractive store design that seemed…