RT Journal Article SR Electronic T1 The Word of Mouth Dynamic: How Positive (and Negative) WOM Drives Purchase Probability JF Journal of Advertising Research JO J Advert Res FD WARC SP 43 OP 60 DO 10.2501/JAR-53-1-043-060 VO 53 IS 1 A1 Rodolfo Vázquez-Casielles A1 Leticia Suárez-Álvarez A1 Ana-Belén del Río-Lanza YR 2013 UL http://www.journalofadvertisingresearch.com/content/53/1/43.abstract AB This study has two main objectives: (a) to examine the relative impacts of positive and negative word of mouth (PWOM and NWOM) on the shift in the receiver's brand purchase probability; and (b) to analyze the effect, direct or indirect, of a number of interpersonal and non-interpersonal factors on the relation between PWOM or NWOM and the shift in the receiver's purchase probability. The data were collected from a sample of 1,035 consumers in four product/service categories. The results suggest that firms should develop a proactive management of WOM communications that takes into account aspects of both the sender and receiver.