What links in traditional procurement can be replaced by electronic commerce?

Travel to purchase and write paper orders. The link of traditional bidding procurement method is to visit suppliers on business trips, and the travel expenses such as handwritten paper orders and signing contracts are the main cost components. However, e-procurement can complete the procurement task without business trips and paper orders, and directly visit suppliers on the Internet to generate orders, thus shortening the procurement cycle, which shows that business trips and writing paper orders can be replaced by e-commerce.