Gommans et al. 2001 claim that trust is an extremely important dimension in online purchasing process behaviour process. Generally, the customer cannot smell, feel, or touch the product. Thus, the marketer should attract customer by create reliability on the online shopping. On the other hand, Grabner-Krauter and Kalusha (2003) point out that
One important reason for the importance of trust in e-commerce is the fact that in a virtual environment the degree of uncertainty of economic transactions is higher than in traditional settings. Internet-based commercial transactions can bring about several risks that either are caused by the implicit uncertainty of using open technological infrastructures for the exchange of information (system-dependent uncertainty) or can be explained by the conduct of actors who are involved in the on-line transaction (transaction-specific uncertainty).