Mason Gaffney and Fred Harrison documented this process in
The Corruption of Economics
Essentially Land has been conflated with Capital, and an anthropocentric assumption made (which Marx also makes) that only Labour is "productive".
This essentially allows the wealthy to exclude economic justification for taxes on wealth, and in particular the taxation of the privilege of private Property in Commons such as Land. "Any economic unit can emit money. The serious problem is to get it accepted" Hyman Minsky
I thought, these principles are completely buried in history. It is fantastic to see that is not the case!
As you see, they were indeed buried...but fortunately they are not dead - far from it!
Indeed I see the principle underlying Georgism - ie taxation of Privilege - as informing a new generation of policies which are based upon different assumptions to the discredited assumptions now being exposed in all their worthlessness. "Any economic unit can emit money. The serious problem is to get it accepted" Hyman Minsky