Not exactly, as money flows to those stocks, they become overpriced, and will under-deliver returns in the future. On the other hand, other stocks will be under

Not exactly, as money flows to those stocks, they become overpriced, and will under-deliver returns in the future. On the other hand, other stocks will be undervalued, giving better returns in the future. So it is a self-correcting system, not a self-fulfilling prophecy.