Retailers and most of the brick and mortar shops store their customer's data to understand their buying and transaction behavior. Some obscure data point that may help them become more knowledgeable about their customers. However, hidden from these in-store shopper analytics are all of the transactions their customers make outside their stores with competitors. In recent past, there are many switching of preference to online one. But this up growing online marketing basically picking the flaws of customers' real time analysis in case of brick and mortar shops. So it's high time to either integrate or dig into flawless marketing analytics.
To read, follow: http://www.forbes.com/sites/forbesinsights/2016/04/27/the-hidden-danger-in-brick-and-mortar-customer-files-amazon-prime-members/#69beabd83681