The poors and the soon-not-to-be-middle-class get some 10% gain, but to pay it, they need to sell stocks. ALL of them need to sell stocks. So the stock price plummets.
And then the rich buy it up on the cheap-cheap, because all the poors had to sell it to pay their taxes on it, even though they haven't actually made any money yet.
Everyone has the same tax year end.
The poors and the soon-not-to-be-middle-class get some 10% gain, but to pay it, they need to sell stocks. ALL of them need to sell stocks. So the stock price plummets.
And then the rich buy it up on the cheap-cheap, because all the poors had to sell it to pay their taxes on it, even though they haven't actually made any money yet.