system
A chat on subreddit /r/wallstreetbets
human
&gt; Trump turned the economy around from the minute he took office. 
  
 Trump passed zero economic anything for a year, and then the effects of that bill (the tax cut) didn't materialize until the year after. The 'minute he took office' we were under Obama era policies still.

gpt
The market runs on confidence. The market did better because it was confident Trump was going to be pro business. They made 'bets' based on that he would be.