In a circular or planned economy, those aren’t really significant measures,

Ok, sure - you just said “different” and did not specify.

As mentioned in the last reply, the Palace of Knossos, as well as the Petra were marvels of craftsmanship and engineering, staggering investments,

That involved massive exploitation and slave labor. And let’s not forget significant taxation, looting, etc.

You comparing them with modern construction methods necessitated by capitalism

I’m comparing them because I’m making the point that profit, price pressures and inflation obviously arise when private entities make huge capital investments.

So now that you’ve actually specified “different” as meaning non-capitalist systems, it leads me to wonder if you thought King Minos sought out volunteers… or did he pay everyone fairly? Are you really using “public” works built under autocratic rule as positive examples we can replicate?