Harvard Business Review - Why do people pour money into hype—like crypto or meme stocks? Speculative bubbles, crypto perhaps being one of the most recent examples, are cases where people think that other people will, in the future, will want to buy in. Some of that's called the greater fool theory of investing, that you invest because you think other people will invest because they think that still other people will invest. The thing is that, of course, bubbles could pop when the market starts t