50%差不多了，老巴60年，也只遇到3次。

“Unless you can watch your stock holding decline by 50% without becoming panic-stricken, 

you should not be in the stock market.” - 巴菲特

So how much does Charlie worry when Berkshire's common stock declines?

"Zero. This is the third time that Warren and I have seen our holdings in Berkshire Hathaway go down, top tick to bottom tick, by 50%. I think it's in the nature of long term shareholding of the normal vicissitudes, in worldly outcomes, and in markets that the long-term holder has his quoted value of his stocks go down by say 50%. In fact, you can argue that if you're not willing to react with equanimity to a market price decline of 50% two or three times a century you're not fit to be a common shareholder, and you deserve the mediocre result you're going to get compared to the people who do have the temperament, who can be more philosophical about these market fluctuations."