system
A chat on subreddit /r/wallstreetbets
human
Question for the group: why does spy trade 1,000,000 shares one minute after close, one minute into post market, but the price essentially stays the same. But at 8 AM next morning 50,000 shares can cause the market to move 200 points. 
  
 Why is this?

gpt
The number of shares trades doesn't matter, just the price transactions are occuring