system
A chat on subreddit /r/wallstreetbets
human
They usually are which has created the “attractive waitress” index to determine how well the economy is doing. 

When the economy is doing bad the first employees to be let go are the ones not very good at their job or have “do-nothing” jobs who are really kept around bc they’re attractive. 

A sudden influx of attractive people now out of a job look for a in between job like waitress. 

So if you ever notice a bunch of attractive waitress in a restaurant that didn’t have then before get ready for bad economic times.
gpt
So you are saying, if we observe how many attractive waitresses are working at a Waffle House, we can infer the price of a Big Mac *and* the chance of flooding?