Question. The below, taken from a comment on this thread, is a common statement regarding stock price movement. > Stock price movements are literally text book

Question. The below, taken from a comment on this thread, is a common statement regarding stock price movement. > Stock price movements are literally text book examples of unpredictable (or more specifically, random walk) I never understand the above. How is this possibly true on long time scales? I can say with relatively strong confidence that Tesla is going to be worth more than $1 trillion in three years. In March, it was clear NVIDIA would boom in the scale of one year. Just, nobody knew how soon and how fast. So the walk is not random in these cases... So in what way are stock prices a random walk? Is the walk pseudorandom? Random with a bias?