Getting Rich Starts from Setting up a Stall

It starts with small things in life and introduces the story, which is generally good, but some details feel that the logic is not strict. I feel that this protagonist's monthly income was not too high before, around 10K, and he lived in a small apartment with a monthly rent of 5,500. It is rare for people to choose this way. There is also this Lao Wang, who previously sold 10,000 yuan in cash, and made nearly 10,000 yuan by selling goods with the protagonist. Can't come up with 50,000 yuan in an emergency? Not very reasonable.