i.e. I'm comparing the lower labour cost of the west in general vs the west before the 70s. https://www.epi.org/productivity-pay-gap/
If you want to deep dive into a present county per county labour cost specifically, then I'd argue yes as well http://projects.sfchronicle.com/2016/teacher-pay/
Anaheim teachers make ~50% more than SF teachers and spend 4 times less proportion of their income on rent.