Unknown Soldier
Member
I guess the question I would ask is why do you believe that the efficient market hypothesis does not apply to these companies? It's not like they are some hidden gems that other investors do not know about - they are some of the most widely covered stocks, and have been for a long time.
They have also traded at the prices they are at for a long time. Maybe one day they will drop to 1/10th their value. But if you are going to try and short GOOG and AMZN don't forget that the market can remain irrational longer than you can remain solvent.