What should the five elements of the financial industry belong to?

At present, the common monetary unit is gold, which can be used in any country. Others, Japanese yen, US dollars and euros. . . . It doesn't flow like gold. At this point, there is an introduction in the book, and there is no need to turn into a dead end.

Five elements, divination, eight characters and technical mathematics are all left over by our ancestors and the crystallization of the wisdom of working people for thousands of years. We just need to know how to use it. There is no need to find out. Just like now, computers and cars can be used as long as we can. There is no need to study their principles and waste that energy.