That ec mode is a new commerce mode on GIS and PIS mutual compositive. This mode debases trade cost via space orientation for commerce information, employs trade decision making by sensibility.

There exist some isolated EC lengths favoring the lowest order or highest order super modes, which are in consistent with the mode coupling theory.

METHODS: The traditional drug trading mode, the public bidding mode and the electronic commerce (EC) mode were analyzed and compared regarding their merits and demerits.