Full text: Konvolut The Personal Distribution of Income 1

10 
Cot (w, w-y ) - Var (w) - Cov ( w,y) - 0; 
Cot (w.y ) a 1 . 
7ar (w) 
If the regression line of income on wealth is 
7 - K.* + 7o 
and/i! if the Tariance and higher moments of the conditional 
income distribution are independent of wealth then we should 
use instead of f(w-y) the function f (ATw* y c - - 7 ) 
and this distribution will be independent of wealth. 
’He can then proceed as before: 
q(j) 
f( Aiw + J c - 7 ) e* Ä1f dw =• 
= c 0?^jexp ~ ( 7 - 7o ) 
] 
q(y) - 0 
for ^W> 7 - 7 C 
for t<w < 7 -7 C . 
The result is now that the Pareto shape of the wealth 
distribution is reproduced in. the income distribution, but with a 
larger Pareto coefficient ( since k’<0 )• This is exactly what 
has to be explained ( income distributions are in fact more 
"equal" than the wealth distributions, empirically, in the sense 
described ). The particular shape of the rate of return distribution 
has no influence onthe tail of 4he income distribution, as long as 
it fulfills the independence conditions mentioned. 
Concerning the restriction w^> y - j c 
it should be remarked that we are free to shift the coordinate system 
to any y c we choose so as to make the aboTe condition Talid, 
with no consequence except that the conclusion about the Pareto tail 
will be confined to incomes in excess of y c . 
It would seem that in practice, in Tiew of the Talue of 
, j 0 must often be more or less high, so that the Parto pattern 
will be confined to a rather narrow range of the income distribution 
while in the caseof wealth it usually extends to the whole of the 
assessed wealth data. This, it is true, partly results from the 
fact that the wealth data are more truncated than the income data, 
in Tiew of the underlying tax laws.
	        

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