I'm going to respond anyway. A stock price does generally reflect all currently available information. If a stock goes from $72 to $270 in a day that simply means that some new information has come in (such as a successful phase 2 trial).
So yes, a stock can be priced correctly at $72 one day and correctly at $270 the next. After all, a few days ago nobody knew whether that new liver drug was going to work.