system
A chat on subreddit /r/wallstreetbets
human
No, it only makes you have $6,600 held in maintenance,  and on 'hold' when you buy or open a future. 
  
    
  
  
    
  
  
 When you close it, then you get $6,600 right back with profit or loss. Make sense now???

gpt
It's a bad description. 
  
 The way it actually works is you give me 140k or whatever it's trading at and I give you 50 times the S&amp;P 500 index value at the end of March (S&amp;P 500 e mini contract). The catch is neither person has the 140k. The 6.5k is a performance bond to make sure each person can keep their end of the bargain.