## Volltext: The Personal Distribution of Income

```8
provided we know the di tribution of wealth. But the distribution
of wealth :s kn wn! It follows the Pareto law - over a fairly
wide range - and its pattern has also been explained
theoretically / 13/-
Denotin- wealth by W , let us write for the density
of the wealth distributinn
p* * c W** 1 dW
or putting w ® In W
p(w) -
c e
•o( W^W
for
w
0
(4)
0
for
w
< 0
If
Y den tes
inco; e and
y*
In Y
the conditional
density functi n f incune can be represented in the f ria
f*(y- w ) t the density of a certain return on wealth. liven ithout
knowing this functi n we might manage to derive the distribution
of income from that of wealth provide! we can make certain
e sha 1 provisionally assume that the istribution of
the rate of return is independent of the mount of wealth.
In terms of random variables, if / CtT and
denote inco e, wealth and the rate of return, we have
If the random variables wealth and the rate of return are independent,
their sum can be represented by a convolution of the corresponding
density functions, and we shall in this way obtain the
distribution of income.
For the purposes of this calculation we shall replace
the density f*(y«w) by the mirr r functi n f(w-y) which is ala'
independent of wealth. The two functi ns are symmetric and have
the same value ( in fact, t e nly difference is in the dimension ;
While the farmer refers t- a rate f return er year the recipr cal
value refers to the number f years inc me c ntained in the wealth ).
The calculation of the density of income q(y)
proceeds then by mixing the functi n f(w-y) with the density
of wealth*
```

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