Comment Re:A Technicality: (Score 2) 195
Your bank only knows that you spent money at Nordstrom. It doesn't have an item level transaction history, so it cannot know that you bought shoes unless it has access to Nordstrom's transaction logs. Therefore, for this to really fly, the retailer has to share their t-logs with the bank. So the banks aggregate t-log data from a number of retailers, and then resell that information back to the retailers.
Ant.