Why is it that the stock market is the same as it was 100 years ago?

While reading about Jesse Livermore a few days ago i could not help think that the market is not much different than it was nearly a hundred years ago.
The same fear and greed that was so pervasive in the 1920s still thrives in the stock market today; not much has changed.
Even the Bible reminds us that most things in human nature remain exactly the same over the course of generations. 
No matter how much we try to evolve ourselves into something better, higher, stronger the inevitability of it all remains that we are inherently weak creatures hat revert back to our baser instincts when given half a chance.
So how does that bode for the Stock Market?  
This all leads to a determination that even as human psychology never really changes so too the patterns of behavior associated with those frailties never changes, leading to distinct market reactions for each market behavior.
Fear never rides out on a Donkey...