Powell will speak on the economic outlook at the central bank's annual meeting in Jackson Hole tonight at 22:00. The market is certain that he will "officially announce" the start of the interest rate cut cycle in September, and the focus will turn to whether the option of cutting interest rates by 50 basis points is still on the table. Powell may be silent on this. At that time, the market may be volatile. Investors are advised to pay attention to the relevant risks.