A while ago I read a passage regarding the economy of different Persian empires. The passage was implying that the Achaemenid Persian empire (a.k.a first Iranian empire) was in total ``far richer" than the Sasanian Persian empire (a.k.a third Iranian empire). This was somehow strange for me as per my knowledge Iran enjoyed a certain golden period during the Sasanian era between the years of 498 AD and 622 AD. In this era the empire can be loosely called strong all round. Some even call it the peak of Persian civilization which would naturally mean flourishing economy as well (If I'm not wrong I read it in Pirnia). Now, my question is:
- Are there enough sources to make an economic comparison between these two empires at their different periods? Is it possible to roughly say which one is by average richer?
- I believe that there are enough historical sources to safely say that both of these empires were notably richer than the Parthian empire (a.k.a second Iranian empire). But I would like to roughly know how much richer.