Very good discussion here as always.
For those interested in origins and foundations of the physiocrats thinking (which also is the origin of Economics in general), I highly recommend L.S. Andersen’s essay “Land Taxing Physiocrats” in a recent Land and Liberty:
Interesting that Quesnay, the father of political economy, developed his ideas in response to Colbert and French mercantilism. While Mercantilism was about exploitation, Economics was to be the science of Justice.
O how far it has fallen!