Avenue Supermarket System

What can I say about my system? It's a supermarket system, but don't think it's simple. It can often do some amazing operations, and sometimes it can make me look like a money-giving boy. One time I asked it what price Yue Buqun would have to pay for the elixirs and exercises, and it actually said that he should go back and teach others with 100,000 exercises. The protagonist's function: Search the coordinates of the world, select suitable objects for plane transactions, and use the things sold to promote the development and stability of the plane.