My friend was laid off by his company and has been lying around at home for a few months.

Seeing others selling marinated snacks successfully at night markets, he decided to pay tuition and learn from a master.
The ingredients + apprenticeship fee, along with the tricycle and miscellaneous expenses, totaled over 20,000 yuan.
His wife is worried about investing the money and not being able to sell the products.
I suggested the simplest solution: his master doesn’t sell for 8 yuan.
Just go buy some from him, rent a tricycle, and set up shop somewhere else.
The marinated snacks you buy from him for a few hundred yuan can also be sold for 8 yuan.
Try it for three days—if you can make money, you can prepare to do it full-time.
If you can’t sell them? Just buy two bottles of beer and enjoy yourself on the third day.