America: Stock Trading and Music in 1920

Mr. Li Ang, as the god of stocks and music, can you share the secret of success? It's very simple, just predict the future. If you can really predict the future, can you give everyone a piece of advice? I suggest everyone not to be blindly optimistic about the stock market. Haha, you really know how to joke. Who doesn't know that the U. S. Stock market will always be prosperous? Black Thursday is still a month away.