Twenty-Seven-Year-Old Trying to Save the World

This is the world of trading. In this world, anyone, anything, or anything can be traded. A Yi came to this world, gained, searched, and lost, and finally decided not to sell it to him, not to sell anything. The iron law of trading: 1. Any entity can trade, and the transaction must be initiated by the person. Once the transaction occurs, the transaction cannot be reversed; once the transaction is witnessed, the transaction will always exist. 2. Traders can only trade people and things that belong to them. (Things belonging to others cannot be traded, and things shared cannot be traded individually). 3. Transactions can only deal with certain existence, but cannot trade with uncertain nothingness.