While this seems interesting, it&#x27;s the average GDP.  I don&#x27;t believe that any breakdown by class or classification of economic stratification at any given time was conducted.<p>Thus it is difficult to see how much of the population of a given era is within a given quality of life (as would be afforded by having enough &#x27;wealth&#x27;) at any time, let alone compare that from time to time.<p>What I do see is that life today should be markedly better than it was about 500 years ago, but that it has largely flattened out within the last 100 years.