A simple old lady backpacked into the bank and wanted to deposit $500,000, and the president received her in the VIP room.

CEO: What are your savings for the rest of your life?
Old lady: Where? I gamble for a living, and I will win every time I gamble, and I just won!
President: "Impossible!"
Old lady: "Then take a bet, there will be a triangular birthmark on your butt tomorrow morning, and the bet is only 500,000!"
The president was hesitant, looked at a bag of cash, and decided to gamble.
After the old lady left, the president went home and checked in the mirror several times, without any birthmarks, until the next day at the appointed time, and then went to the VIP room.
The old lady arrived early, and next to her stood a well-dressed lawyer.
Old Lady: Today the lawyer testifies to examine your ass.
President: "There's really no birthmark, let alone a triangle." Then take off your pants and let them check their butts...
The old lady looked: "Sure enough, no, I lost".
At this time, the lawyer's face was pale, and he kept banging his head against the wall, and the president was shocked. Lawyer: "She just bet 1.5 million with me, saying that you would take off your pants in front of her and let her see your ass!"
This paragraph is actually called "risk hedging" in circles. In the investment portfolio, we can not only focus on the performance of a single asset when making investments, but ignore the correlation between assets, sometimes the loss of one asset in turn will lead to the profit of another asset, in the big picture, the whole portfolio is profitable. Always remember that the return of the portfolio is our ultimate goal, consider the correlation of assets, and do a good job of hedging.