Amazon.com Inc. had its biggest sales day ever on Prime Day (July 11) and marketplaces sellers got in on the action too. Marketplace merchants’ sales grew 80% on Prime Day compared with an average day for Skubana retail clients, according to data from the technology vendor that helps retailers and brands sell on marketplaces, including Amazon. That sales growth was helped by Amazon.com’s Prime Day traffic soaring 69% higher than on an average day in June this year, according to web measurement firm SimilarWeb Ltd. And with all the extra eyeballs, marketplaces sellers made sure that their products were an attractive buy. Data from analytics firm Boomerang Commerce found that marketplaces sellers offered an average discount of 45%, which is deeper than the average discount Amazon offered on its first-party inventory, which was 35%. But those steep discounts mean marketplaces sellers cut deep into their profit margin. Which begs the question, are the additional sales even worth it?…

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