Because much of investor behavior is (arguably rationally) not driven by business fundamentals, but how they assume other investors will act. This can lead to c

Because much of investor behavior is (arguably rationally) not driven by business fundamentals, but how they assume other investors will act. This can lead to counterintuitive and self-fulfilling group think behavior where the metrics might drive the stock price because of an incorrect perception that others value that metric, regardless of actual sentiment.