Although extremely popular, electronic commerce environments often lack information that has traditionally served to ensure trust among exchange partners. Digital technologies, however, have created new forms of "electronic word-of-mouth," which offer new potential for gathering credible information that guides consumer behaviors. We conducted a nationally representative survey and a focused experiment to assess how individuals perceive the credibility of online commercial information, particularly as compared to information available through more traditional channels, and to evaluate the specific aspects of ratings information that affect people's attitudes toward ecommerce. Survey results show that consumers rely heavily on web-based information as compared to other channels, and that ratings information is critical in the evaluation of the credibility of online commercial information. Experimental results indicate that ratings are positively associated with perceptions of product quality and purchase intention, but that people attend to average product ratings, but not to the number of ratings or to the combination of the average and the number of ratings together. Thus suggests that in spite of valuing the web and ratings as sources of commercial information, people use ratings information suboptimally by potentially privileging small numbers of ratings that could be idiosyncratic. In addition, product quality is shown to mediate the relationship between user ratings and purchase intention. The practical and theoretical implications of these findings are considered for ecommerce scholars, consumers, and vendors.Keywords Ecommerce · Credibility · User-generated content · Amazon · Product ratings · Electronic word of mouth · Information credibility · Purchase intention · Product quality · User ratings People are increasingly relying on web-based commercial information for electronic commerce ("ecommerce") transactions that range from small personal items to home purchases [45]. Retail ecommerce sales in the U.S. currently constitute roughly 4 % of total retail sales, which translates to almost 40 billion dollars annually [10]. The number of Americans who have purchased a product online has steadily increased since 2000, and a majority (66 %) now report having made at least one online purchase [46]. An even larger percentage (93 %) has used the Internet for ecommerce-related activities, including researching information about a product they are thinking of buying, with more than a quarter of Americans reporting they do this on a daily basis [49]. In fact, over the last decade the number of people either researching or buying a product or service online has nearly doubled, a trend that holds true across a wide range of ecommerce-related activities [45].Despite its popularity, online commercial transactions often lack elements that have traditionally served to ensure trust and credibility among exchange parties. Indeed, varying "patronage modes" embody different levels of risk for the consumer, which incr...