I Have the Ability to Make Money in the Last Days

When the end of the world breaks out, human lives are like mustard, money has become waste paper, and materials are everything. But the system I have is that everything can be exchanged for money. I would be embarrassed to accept all of other people's useless money. I can easily buy the supplies that others are looking for if I have money. The power that others have worked hard to cultivate, I can easily improve if I have money. The antidote to zombies that others can't find, I can easily detoxify it if I have money! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.