The present invention describes a system of automatic interaction between three groups of participants: a multitude of health care provider units, pharmacies or pharmaceutical or medical device manufacturers, a central organization system and a multitude of potential health care users or payers such as potential patients or groups of patients, employers or insurance companies. The purpose of the automatic interaction executed by the central organization system is to determine the best or lowest acceptable negotiated price for healthcare services or medications/devices by interested parties such as individual patients or groups of patients, employers or health insurance companies and resulting into a contract that will apply over a comprehensive all-inclusive list of health services or medications or devices, and that will result into health services rendered or medications or devices being sold from the all inclusive comprehensive list of services, medications or devices at any time during the time period indicated in contract.