I imagine that economists probably correct for inflation when putting this data together. I can't speak for these graphs 100%, but I think the real issue we're

I imagine that economists probably correct for inflation when putting this data together. I can't speak for these graphs 100%, but I think the real issue we're talking about here is not money or people but resources. Resources can be roughly mapped to people, with the confounding factor that each person consumes a different level of resources. As we approach the resource limits of our planet (and potentially nearby planets) that confounding factor becomes less relevant, because we eventually won't have enough resources available for anyone to consume more than they strictly require to stay alive.