The folks at the Levy Institute, particularly Randy Wray (Now at U of Missouri), have gone into this in a big way.
Their take, much boiled down and simplified, is consistent with CG but explicit in a different way. Their thesis is that money arises not as a medium of exchange but as a means of administering debt. It is created by and for the rentier, sometimes under the auspices of government.
This is not to say a medium of exchange is without use, but puts a different cast on the story. I have no idea if it is true but it is entertaining and offers a pleasingly malign interpretation.
mbs