Reduced Overhead
Your ecommerce site is able to manage its own inventory. Moreover, the cost of starting one of these stores on the internet is quite low when compared to the cost of building a physical store. You need minimal licenses or permits to get your online store up and running. Plus, you do not have to rent a space for your store.
Very few employees are needed. They are required for jobs that the computers can't do on their own, like answering questions that have been asked by customers. Usually, an online store is easier and cheaper to run than a physical store.