[ephbit]

> I'm not rejecting the cantillon effect wholesale, I'm asking for a quantification ..

You might as well ask for a quantification of the Matthew Effect [1] ... you won't get one. Would it be helpful? Yes, probably.

But more important than having a quantification is, that people register the fact that such effects exist. Depending upon how most people would define fairness, the conclusion from the existence of these effects could then be: there need to be measures taken (taxes, subsidies, ...) so there's some degree of compensation, otherwise society will find itself in an (unnecessarily) instable dynamic.

[1] https://en.wikipedia.org/wiki/Matthew_effect