For a certain income y the probability p of getting more than that
will be attained by the the proprietor of an amount z of wealth
or of an amount z of education.
And for another probability?
For another income y, there will be another "role of substitution"
between wealth +education.
Indeed it is obvious that for various levels of income substitution roles
will have to be very different, because for a rather high income
no amount of education will be sufficient to ? for the wealth
which can bring that income.
In our n-dimensional schema of hierarchies we
can determine for each income y and for each ?p
the various equivalent combinations of wealth, education ? etc etc