extracted text

PaOF. DA J . XIÏÏBSRGEN

THE HAGUE, 10 October 1950
Sljzenlaan if 1.
liJr William B. Simpson,
Managing Editor of"Econonetrlca"
University of Chicago (37^ 111,

Dear Mr Slrapson,
.
Please, find bjEclcxBesi a few remarks on Lul*s
ar.tlcle for Econonetrica. Since one of my collaborators my
friend dr Stuvel, just publlshei a book on the sa-re subiect. I
wonder whether it would not be useful to ask his opinion too.
Since rar Stuvel Is absent for a week I propose that the manuscript is sent back after tse has had a chance to see It. Please,
let me B:now If you are In urgent need of It.
ïours very slncej:'ely,
NOTICE ON m LUI'S ARTICLE
to h.^nnM?o>.*^^ Sï^^^^^^^^^ig^ly Interesting and certainly deserves
. to be published. The following remarks may, however, perhaps lead
J some slight improvem-ent. They are ma* in haphazard order.
^'M

./^'?" wording used 4n the table Is somewhat suggestive of
optimism" since mr Lul always speaks of conditions under which
1-provement is certain. It might In a number of the cases have
wv?^>, *?''"r 4*^'^4..^'' ^.''•°'"® neutral way by adding conditions under
which deterioration is certain.

2.

It is a small lack of elegance that the symbols for countis^ 2
have a subscript 1, whereas there also exists a country 1. '^y
not speak of country 0 and 1 ?
"^ "^
^

3.
Is it correct on p.10 to speak of the solution of any of the
varia Dies in terms of another ?
---^.
It is a pity thkt the numbering of the "steps" do not
correspond with the numbering of the equations.
^

The true character of aquation 10 would seem to me to be
.-^^ï''P]:^^'^Ï^J^-°"5^**i' wording In which it is announced suggests

iHr and
and 6.
6 If
I f iitf is
?r?>,^'^':^^^^°?.'
'° be
^* a^°"1^
duplicate
the intention^^ï.^^
that it
demand
equationequation
I would opposei. I think it would be. better to have a sur^plu
equation here^fnstead of £ ^ to use/%lastlct$j^, of x with' repect
^\r.A
r'^y/^® ^° ^,^'^'^7
mentioned in the list of parameters,
and why is ,u mentioned as an independent parameter?

,111 ^^*") os«i5l?(2 "ïo

fifBtBvïnü
j ïi'i^oXosBé bail

^

^ ,^.

...t'

.0Q# fl«lfilqo .alii ^SB o* X«la«ü ©é #oa bMm'-i-i

*tBd^^-m

,•#1 sen .-^ AortBrfo B bBri sBri ?^^ %mt%ii\ ••É^€tm9'
ëi
,it l o bean :fnesiii fil »*!«i»Q^ H w©fi« aw

3J0ITM, Ö'IUJ H!. VIO 301 TOK
nnr^ssb Y-tnlÊjf'Teo bxis gnl*39i9;*nl xld^id
a l 9 l o l ; t ï « »ri* 3tol4i?
f;r^9l ?,qBrfi©q -isvewoff .XB.ïr a^fiBRiei 3/ilwoIIol eilT .bsriBlXdijt^ -•
s*!oa
, • X ^ • ^ ^ t r l P)TG5:.Erf(TFff n± *srr s t e x^riT .d-nBrr!OVX)iqrl id'^ïl^.
riolrfv; i s t n i j 8nol;tlbfloo l o s^^söca 8-^BV;X£ Iwa x '•:'Oiile "EssXiel^qc
©verf 898B0 9.rfd- l o iBcfmjjn s n l ;rfi§ln il ,aïBii&o e l ^nomevoiqml
lobnü anol^lbnoo ^aibbs ^cf x^w lei^tusti ©lom e n i betfiXüm^ol a^sd
.nlf'l'i'^o el no.M'BioJ"i'?ct9b riDlffw
o

"" vo";' »r YT:tnnno ,6 a:t^lx.© ORIB
to vnB l o nóM-riTcr' sdj
•-"--

asöïedv/ ,
<? t bn.& 0,^4

©19X1*

C-X

iJ

#--

• ^ • ^ » ® c { « 'd"aa

l o >'r=ea8 oi Ot.q no i o e i i o o cH zl
*
? i'6)ii.tonfi l o amied- n l asXcl*!!!!^

.ton of^ "sap;t?." 9ri.t l o gnli9dniun Bd..
a l d"!
.
.anol:fsup9 sdi l o gnli9diajj^;ipiÉti.;iii^xw baoqaafi©®
9d o^ ofïT o.t j?'99S bluow Of nold-Slips l o latosifiiio suii odT
',j^^-.^2xja bsonüonnfi s i iï doid^i nt •gntb^ow 'MS jaol^tejjpe %lqQUB
nai-^Bi/p© acTBOlXQi/b bXwow tï os 11 :tjjd ^nolctÊtip© bnameb B a l ^ i j ^ ^ ^ fiol^fisps bnspeb B ed ctl ctföxli nol^tneiril Bdi a l i l I I .0 bns t^
i|Xg0ja8 B svBri o:t aadJscf ,9d bXaow it ilS^Ai l M^oqqo bluow I
t o s q a i ' r i ^ l w Y lo-ï«iftol.+ 3BX9''93ii o.t ,.. -. l o bserfRnr^Tsri nolcfsupo
fTiteiemsiBQ

l o . i a l l arid' al benolJnsffl ;r |snB..)i oxi tsur. <.::.•.

<? ^.-.;.:v.v. v. •, ;^n<ifnnfTAf:nt nc ?J? bénotct'n9fn JJ a l X^w bnfi

,d