PE ratios don't support corporate stock prices increasing, what is causing this the stock market bubble ?

[Golfer]

To answer your question---play money and soon a dollar won't be able to buy you a candy bar. OOOPs a 10 dollar bill won't buy you a candy bar we already went past a dollar.

[Foolishhaircut310]

People with money who want more but can't invest it
because there is no demand for more goods
because consumers can't spend more
because they have no savings
because they are paying off debts
because they borrow too much
because they can't make ends meet
because their salaries are too low
because profits are too high
because (infinite loop to the top.)

[Philip H]

It is going up becausae the Middle Class is slowly vanishing.
Okay, I admit that sounds silly since the middle class with their IRAs and 401Ks created a huge market boom, but bear with me.
The value of money has been reducing at significant rates.The Government is printing large amounts of counterfeit cash. It is disbursed widely and much of it is received by the unemployed and those on welfare for a variety of reasons. They have little "spare" cash so they spend almost all they get.
That money ends up going into the pockets of corporate farmers, energy producers, etc. and all those corporate "wealthy" have no where else to put it for a good return other than in the stock market. At least they are investing in something gthat has assets and makes a profit (unlike Twitter).
They ae not investing in new production facilities. They are not hiring new workers, they can't get decent interest rates, where else can they expect a return?
The more counterfeit money the government prints the more there is to put in the stock market. Essentially, that money doesn't go anywhere else at this time.
The Stock Market isn't really going up. The value is staying about the same because the value of the money represented by stocks is lower.
Since China has stopped buying control of so much Gold and other prescious metals, that market is not an assured income producing investment. Nowhere else to turn at this moment. It is a bubble of sorts and will eventually burst - again.
Adjusted for value, the Stock Market isn't really up.