BBC programme " The Truth About Supermarket 'Bargains'

link
British-centric but worth a read/watch.
Asda is part of Walmart.

Quote:

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Britain's biggest supermarkets spend a lot of advertising money telling us they offer great value. But an investigation by Panorama has revealed that not all "bargains" are quite what they seem.
The deals at Asda, Tesco, Morrisons and Sainsbury's might seem to be everywhere, but strip away the jargon and catchy promises of "huge savings" and "special offers" and you are just as likely to find tactics that experts say range from a bit cheeky to others that could lead to prosecutions for breach of consumer protection regulations.

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Not surprized at all - it's very rare that we shop at WM. Their lowest price hasn't been 'the law' for very many years...

I knew that about WM, they have done a really good job advertising that they are the lowest, when in fact their prices compare with just about anywhere else, even Loblaws' prices (when I worked there) were always about the same price. SDM is slightly different, they tend to have higher reg. prices but generally have good sales (and then coupled with the points it makes them a popular destination regardless).