In addition to in-search results and in-product detail pages and header, footer, sidebar, promotions, and ads, it's also typical for buyers to opt in to receive notifications about items that might be out of stock, items that may be left in the cart, abandoned cart emails, and other notifications. We can also include promotions, advertisements, and recommendations into these emails.
These are transactional emails that are based on the interaction that that buyer has with the with the marketplace. It is very common to provide promotional spots within those emails. The eCommerce marketplace application will dynamically build those ads and incorporate the tracking for those so that the vendor can see what their results are.
Needless to say, it's definitely a very powerful component to help boost the interactions within the marketplace. It's also very helpful from a monetization perspective to help monetize the marketplace and give it more resources so that the advertising and promotional dollars that are invested from the sellers can go back into making the marketplace even more powerful, and automate more of it, and make it more capable of delivering value both for vendors and for sellers.