Electronic transactions follow formal rules embedded in the information system, and they indeed bring rigourous formality to business. Yet, existence of formal rules creates a natural opportunity for procedural corruption, when rules are tweaked by employees, managers or owners for personal gain instead of an organizational benefit of the company.
The more complex is the knowledge on which such formal rules are based, the greater are the corruption chances.
As information technology in e-commerce is complex, the corruption may soar, while numerous victims with limited knowledge in this field may not even perceive their losses, until it is too late.
In brief, one single index may not be reliable enough to make a clear-cut conclusion about the link between the e-commerce and perceived corruption level.