If you sell on a marketplace, the people browsing it are already looking to buy. Marketplace advertising lets you pay to place your listing in front of them, above other results. In this article, traffic method number eight, we explain how marketplace advertising works on Etsy, Amazon and Fiverr, how to test it with a small budget and what ACOS tells you. Marketplace advertising means paying the platform to make your listing appear above others in search results, or in prominent positions across the site.