Are there any profiteering industries that ordinary people don't know much about?

Dentistry is very profitable, whether it's cleaning or correcting teeth, it's expensive.

Generally speaking, 500 yuan is the cheapest place to fill a tooth, and thousands of dollars are expensive. Things that cost tens of dollars can be sold for thousands of dollars.

Wedding photography, a set of exquisite wedding photos is every girl's dream, and a wedding photo album basically costs 10 thousand yuan.

As long as there are satisfactory works, many people are willing to spend money to take wedding photos, so wedding photography does have a violent industry.

Optical shops, nowadays children have been exposed to electronic products since childhood, and many children are nearsighted. Optical shops can get a pair of glasses at will, starting with at least a few hundred dollars. This is a profiteering industry, and the glasses industry has always been in a space of gray violence, with considerable income.