It's almost certain that Buffet would be actually analyzing these stocks rather than just jumping in because people may be being fearful.
Can you explain why this is time to start buying?
If you can explain why people are selling so much so fast right now, that might help your argument.
My comment was not meant to start a conversation about the meaning of efficient markets, but to get wheaties to explain his reasoning.
In principle, the two do not necessarily have to move in lockstep. However, because of the massive size, prominence, and stability of Toyota, one would ordinarily expect them to correlate extraordinarily heavily as anything else is an exploitable arbitrage opportunity.
and of course you can also do regular pairs trading (if they drift farther apart).