From Barber to King of Quantification

Lin Chuan, a barber in a village in the city, is too poor to fall in love. Picked up a mysterious notebook. The first half teaches him to use 10 yuan to cut hair and beat his peers, and the second half teaches him to use mathematics to harvest the global market. He lost all his savings, turned around, and opened three shops. Everyone thought he was just a barber shop owner. Only he knows that the float saved by opening the store is to activate the real trump card.