20 
<1' 1 ' (y) * q.' 1 (w) * f (tc w - y ) (11) 
How can this series of transformations square 
so as to produce a steady state of the joint distribution? 
^o explain this we have to separate income at least theoretically 
into earned and unearned income, -he distribution of earned 
income has to be regarded as given from outside; its explanation 
has to be sought separately; empirically at any rate it is 
a Pareto distribution. It may be regarded as constant in the 
simplest case. From it flows the continuing primary accumulation 
which contributes to the accumulation of existing wealth holders 
and also creates new wealth holders ( a kind of social mobility ). 
This wealth then creates property income and secundary accumulation. 
The process leads from a relatively moderate inquality of 
earned income to more unequal primary wealth, and even more 
unequal secundary wealth. 
■**n this way wa can imagine that total income 
and total wealth will grow at constant rates. The corresponding 
allometric proportion does not appear directly in the cross-section 
where instead appear the two regression lines which are neither 
of them a reliable estimate of the ratio of the two Pareto coefficients. 
Can this be regarded ad the reason why the attempt 
at empirical verification of equation (Qj on the basis of Swedish 
and ^uich data lead to unsatisfactory results?