Judging from the recent news, I learn that we've to ignore short-term swings esp. if you're a long-term investor.
I bet oil price will be up, PR bankrupted, Japan down, China fine (moving from factory to service)... Now, Sony will be up (the worst is over).
If we care about the short-term news, we will not have a good sleep which is worth all the gold in the world.
A joke on Buffett.