Chart predicts the San Francisco Rent using 3 variables

[DG A.]

I found this awesome article:

https://medium.com/@andersem/a-guy-just-transcribe...

TLDR:

It’s a chart that almost perfectly predicts the San Francisco housing market using only three variables:

1. The number of jobs located in San Francisco County.
2. The number of places in San Francisco County for people to live.
3. The total amount of money that is paid to everyone who works jobs in San Francisco County.

What do y'all think about these as predictive variables for what direction rents are going?