Marketplaces can be of various sizes and shapes. For example, there are giant players as Uber or Amazon along with many promising startups like Depop. There are various marketplaces. For example, food ordering service (e.g. UberEats), taxi services (e.g. Lyft), renting service (e.g. Zillow), and so on. Regardless of the different marketplace types, there are several main metrics for evaluating the service's success.