US Patent 8639567 Systems and methods to identify differences in spending patterns

In one aspect, a system includes a transaction handler to process transactions, a data warehouse to store data recording the transactions, and at least one processor coupled with the data warehouse and configured to identify a first set of customers who made first transactions correlated with an advertisement, identify a second set of customers not in the first set of customers, and determine a difference between a first pattern in a first set of transactions of the first set of customers and a second pattern in a second set of transactions of the second set of customers.