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DR J. TINBERGEN

THE HAGUE, 16 August 1951
Sijzenlaan ^-1

Mr M. Fleming,
c/o CóTumbia University
Department of Economics,
New York 27,
USA
My dear Fleming,
It is with the greatest interest
that I read your paper in the Economic Journal,
vi^iich you announced to me already some time ago. As
you may understand I was particularly fascinated by
what you say about ranging the countries in an order
of strength, and I think that I only partly succeeded:
viz. for cases where
(a) supply and demand of each commodity only depend
on the price of that commodity, or
(b) take account of interrelations between demand
but then only if also commodity prices are
kept constant. Here I added the assumption that
all home products not exported are consumed at
home, say, because of the full employment.
In fact, I think that in your fi,
in the most general cases, somewhat too much is
hidden, as you more of less indicate yourself.
My main suggestion in this letter
is whether you are going to publish some^^thing more
about the mathematical proof of your statement. Since
I am thinking of writing a note on your problem I
should be glad to^know what you are doing yourself,
in order to avoid duplication.
With all good wishes,
yours as ever,

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