System and method for analyzing payment card transaction data

A method for analyzing payment card transaction data, comprising:

• storing transaction information, said transaction information including, for each transaction:
• an identifier of a physical terminal at which said transaction was conducted, an indicator of a time at which said transaction was conducted, and an indicator of a cardholder account number to which said transaction is charged;
• accessing said transaction information;
• and
• analyzing said transaction information to compute from said transaction information an indicator of a presumed acquaintance between a first cardholder with a first account number and a second cardholder with another account number in response to said first and second cardholders conducting respective transactions within a period of time at a given terminal a plurality of times within a given interval, said interval being greater than said period of time.

A computer readable non-transitory storage medium storing instructions of a computer program which when executed by a computer system results in performance of steps of:

• storing transaction information, said transaction information including, for each transaction:
• an identifier of a physical terminal at which said transaction was conducted, an indicator of a time at which said transaction was conducted and an indicator of a cardholder account number to which said transaction is charged;
• accessing said transaction information;
• and
• analyzing the transaction information to compute from the transaction information an indicator of a presumed acquaintance between a first cardholder with a first account number and any further cardholder with another account number in response to said cardholders conducting respective transactions within a period of time at a given terminal a plurality of times within a given interval, said interval being greater than said period of time.