That’s a consequence of suburbanization and divestiture from the major auto cities (Detroit, Pontiac, etc) in Michigan.

In recent years there has been meaningful investment and growth in Detroit [0], but a lot of auto money is in surrounding areas like Grosse Pointe [2] and Oakland county [1].

[0]: https://fred.stlouisfed.org/series/DETR826PCPI

[1]: https://en.m.wikipedia.org/wiki/List_of_Michigan_locations_b...

[2]: https://en.m.wikipedia.org/wiki/Grosse_Pointe,_Michigan

Edit: mentioned Grosse Pointe

I live in Detroit. We have tech positions and several employers that are doing fine. If you haven’t checked out the city in a while, I’d encourage you to. It’s really starting to rebound.

Detroit the metropolitan area is doing pretty well. The executives live in the suburbs.