system
A chat on subreddit /r/wallstreetbets
human
What you can't tell from that chart is how often bear markets last for longer than a single year:

1929, 1930, 1931, 1932

1939, 1940, 1941

1973, 1974

2000, 2001, 2002

Odds of 2023 being positive are 50/ 50 at best.
gpt
When we look at down markets, one of the common themes is tight money.  So to help people answer their own question: As we enter 2023, is the FED pursuing tighter credit?  Or are they easing access to money?  Question answered.