[hansvm]

Lots of other factors too, but look closely at your word choices -- "wealth" vs "money." Wealth is mostly tied up in non-money assets (not that it necessarily has to be, but that's the state of things), whereas poor people have some small amount of cash, wages which don't track with inflation, and rent and expenses which do. As money is devalued, non-money assets continue to hold their value (increasing when denominated in dollars), and every financial instrument used by anyone at or below the low/middle middle class is royally shafted in comparison.