Imho aggregate deflation(inflation) metrics would be the best proxy for overall economic growth together with productivity measurements at the single good level.

Therefore the average economic growth basically will be a function of productivity increases, i.e. of technology improvements. How much on average? I don't know. In a hypothetical full-reserve banking system growth should be likely slower but much more stable, thanks to the end of the credit boom & bust cycle.

It's just my educated guess, maybe I'm wrong as shit. 🤷🏻‍♂️😂