Markets can stay irrational for longer than you can remain solvent. Just because the bubble hasn't burst, doesn't mean we are not in one. Of course the converse

Markets can stay irrational for longer than you can remain solvent. Just because the bubble hasn't burst, doesn't mean we are not in one. Of course the converse is also true, just because the market has been going up doesn't mean it will go down. It will be interesting to see what happens if the Fed ever raises the interest rates.