system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: All the madness that you always see on the Wall Street trading floor, what is going on here? Why is everybody yelling?

Always wondered.
gpt
So first of all, this doesn't really happen anymore.  Now computers do most of the trading.  What you see on TV is planted to make it look busy.  The floor is usually pretty empty.

Next, when people were on the floor, you can think of it like organized chaos.  There were hundreds of people crammed into the space and they are all buying and selling stocks based off of what the stock market is doing at that moment.  It was so hectic because the stock can change faster than you can blink.