An economics professor told me once; > Bubbles grow against walls of doubt. It is when the bubble must stand on it's own that it bursts. If these markets leve

An economics professor told me once; > Bubbles grow against walls of doubt. It is when the bubble must stand on it's own that it bursts. If these markets level out, and people stop investing because you can no longer get 20% returns every week, that is when things are going south.