See the documentary “Mind over Money” (search on Youtube) – it’s quite a fascinating look at how the bubble/bust cycle is in our psychology and how there is vehement denial during the bubble phase and then the eventual bust – it’s a pattern that’s repeated again and again and again due to irrational behavior exhibited in the rush to make money – the sentiment is everyone is onboard this train making money, I should join too. But in reality there is a saturation point at which the whole thing comes out of gear and falls apart.