There is a major in the university called "financial engineering", which covers a wide range, such as stocks, futures, global economy and so on. I know several people, all of whom study financial engineering. After graduation, some entered research institutions to engage in economic analysis, and some entered large fund companies to engage in the operation of stocks and futures. When others do it themselves, when the general trend is not good, people can easily make money, just because they know more about this business, so they know.