Recently ASDA launched a price policy which allowed you to take your ASDA shopping receipt home, punch in the special code on the receipt and it would automatically price check the whole shop against Tesco and give you an ASDA voucher for the difference if they were more expensive.
Not to be outdone, Tesco started the same. However within weeks Tesco had to change it's policy and reduce the amount you could claim back.... Why you ask??? Well its because too many people started discussing on specific blogs exactly which products were more expensive in Tesco and thereby increasing their voucher claim if they specifically purchased thoes items.
Tesco has received a lot of flame for this on their Facebook page too after back tracking on the original price policy.
Websites like mysupermarket.com do checks on a daily basis against the popular supermarkets and make them avaliable for all to see. Super eager savers use the website to spread the word on where the largest profit it to be had when the price difference between Tesco and Asda is large for a particular product and then websites like moneysavingexpert.com and twitter help spread the word like wildfire.
Hence too much information has forced Tesco to back track and its good to see even a giant like Tesco can be brought down by avaliabilty of information.
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