Roman Empire GDP per Capita Map Shows That Romans Poorer Than Countries Today (brilliantmaps.com)

Ah...get a good whiff that....woohee...good ole GDP. Useful for everything. Its like the duct tape of economic theory

Correct, they had so very few capital improvements back then. They leveraged the ones they had quite well, but they were just dirt poor. You yourself have luxuries that even the most fabulously wealthy Senator or Emperor would envy.

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They were so poor that they didn't have any airports.