If Abbott Labs opened at $50 tomorrow.... something FUNDAMENTAL happened to the company and forecast earnings have been reduced by ~1/2.You're getting close to understanding it. Would you say that a stock that was once a $100 and was now a $50 stock needs a lot more external force to return to $100 than it needed to drop to $50?
(Think of this as in a trading range not so much as a capitulation for simplicity)
And aside from a dead cat bounce on a brief oversold condition... it's not going back to $100 anytime soon.
The only external force that will get it back to $100 is when the historic PE multiplied by forecast earnings equals $100.... give or take some for the range of the PE and overall market sentiment.