C405 Yin Difference and Yang Error

"Alright. I will give you an electronic document, in the future, you will be able to buy items at a discount of 10% on average from any guild that is controlled by the hot-blooded military academy, Dragon Fang, and so on. As long as the items you buy don't exceed 50% of their inventory, they have no right to refuse. This is already the highest authority I can access, if more