[PDF] The Valence of Online Wom on Product Performance pdf online. The dynamics of online word-of-mouth and product sales-An empirical investigation of both a movie's box office revenue and WOM valence significantly influence WOM volume. WOM volume in turn leads to higher box office performance. Word-of-mouth (hereafter, WOM), defined as the array of informal decisions about whether to buy or not a product or a service either online or online. Well as the economic performance of a company (Ne