Purpose – Recently, an increasing number of Internet users have begun to purchase various
products, both secondhand and new, from online auction websites. However, some Internet users are
still hesitant to purchase products from these websites. Moreover, the factors affecting male and
female users’ intention to shop on the websites may be different. Past studies have indicated that
uncertainty is a major determinant of online shopping behaviors and may have different effects on
men’s and women’s purchase intentions. Therefore, to explore the differences, this study seeks to
propose a research model based on uncertainty and agency theory.