Do Sellers Benefit from Sponsored Product Listings? Evidence from an Online Marketplace
研究发现消费者更偏好排名靠前的自然搜索结果，而非同一位置和产品的赞助列表，这对评估赞助广告效果有参考价值。
This paper shows that consumers prefer organic listings in the top-ranked positions to sponsored listings of the same product/position in an online marketplace.