これは確かに基本ですね

　散人先生⇒Letter from Yochomachi (Blogger): NYT:Switching to Cash May Feel Safe, but Risks Remain
　⇒Your Money - Switching to Cash May Feel Safe, but Risks Remain - NYTimes.com

If you can’t afford to live off the proceeds of cash investments (or dividends from your investment in your kids’ pizza joints), you may have no choice but to hold on to whatever stocks you have left. Then, you can hope for a rebound that will allow you to live out your later years more comfortably. Selling now and moving to cash could mean guaranteeing a lower standard of living for the rest of your life, because you’d be locking in your losses.
　
But if you’re a bit younger, try to think of your investment portfolio in the same way you consider the value of your home, if you own one. After all, if you’re not moving anytime soon, your home is a long-term investment, too.
　
“Today’s price is not your price. Your price is 10 or 20 years from now,” said Thomas A. Orecchio, of Greenbaum & Orecchio, a wealth management firm in Old Tappan, N.J. “Unfortunately, stock market investors don’t always see things that way.”

　実際、普通の機関投資家はそうやって投資しているわけだけど。
　まあ、しかし今回はきつかった。というかまだきつそう。