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Online marketplaces are increasingly adopting innovative business models such as paid advertising as a major revenue source. We study the effectiveness of two popular advertising tools, sponsored search and social media endorsement, in increasing traffic and sales for online sellers at a retail e-commerce platform. We find that, controlling for sellers’ self-selection behavior in choosing their strategies, both sponsored search and social media endorsement can significantly increase traffic for sellers, with sponsored search being more effective than social media endorsement. In contrast, only sponsored search has a positive and significant impact on sales. In examining the differential effects for sellers with low and high reputations, we find that sponsored search is more effective in increasing traffic for low-reputation sellers, but its effect on sales is larger for high-reputation sellers. Moreover, although social media …