So what is the basis for the dollar that is worth a dollar? Is it an average? Is it one particular state or city??
Suppose rent in Dallas is $1000 a month and for a comparable apartment in Seattle it is $2000 a month, and in Biloxi it is $500.
Choosing Dallas as a base, a dollar in Dallas is worth a dollar. Since Seattle would only buy half a month’s rent compared to Dallas, Seattle’s dollar is worth fifty cents.
By the same math, Biloxi’s dollar is worth two dollars.
If you drill down far enough, you end up here.
https://www.bea.gov/news/blog/2019-05-23/check-out-buying-power-your-metro-area