A History of Merchants

The time travel history of an ordinary businessman. There is no invention, only the application of wisdom. Zhang Tianbao accidentally came to ancient times. He knew that bombs would explode, but he didn't know how to make them explode... He knew a lot of things, but there was nothing he could create. But it doesn't matter because he has modern ideas. The gap in knowledge is a quantitative gap, but the gap in concepts is a qualitative gap. In a strange ancient society, you can still make a lot of money selling steamed buns, rice, cloth...