As they say in their promotions for the campaign, ‘They’ve shopped around so you don’t have to’. Put simply, each week Pick n Pay checks the prices of 1000 products against other supermarkets’ prices. Then when you shop, they check if you have any price-checked products, and give you a cash-off voucher for the difference. Here’s a video to explain how it works:
http://youtu.be/NrfGcHHjvfQ