With over 200 different varieties of canned tomatoes on Walmart shelves, the complexity of putting a sticker on any one of them has exploded. This past week I visited the offices of Dunnhumby, a company that started off as a charming husband-and-wife operation in 1989 and has since grown into one of the biggest customer analytics firms in the world. It specializes in collecting and making sense of the masses of information supermarkets collect on a daily basis — both about their own operations and their customers’ particular shopping habits. It’s all about ensuring logic at the shelf, says VP Sean Dangler as he walks me through a demo of the KSS Retail PriceStrat software.