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Title
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Letter to Zhaorong Wang
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Recipient
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Wang, Zhaorong
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Date
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1991
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Date in document
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yes
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Formulas or calculations
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yes
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Inventory number
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NL-RtEUR_TBCOR_A.2.2-50
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69
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Storage location
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Specifiek Magazijn
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Filename
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CDM69_NL-RtEUR_TBCOR_A.2.2-50.pdf
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Provenance
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Jan Tinbergen
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Accrual Method
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donation
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Revised transcript
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en
Prof. J. TINBERGEN
Op 1 okt. een betere brief geschr.
2566 XD DEN HAAG, Sept. 30, 1991
HAVIKLAAN 31
TELEFOON 070 - 364 46 30
Dear Professor Wang,
I was very happy to meet you personally and to meet Mr. Zhang. After your visit I found out that my answer to the questions in your letter of September 20 was incomplete. Here is the complete answer:
(1) I think formula (2) should be a1 z1 = a2 z2: look at the definitions of z1 and z2
(2) Your second point is correct
(3) You are also right that there is a typing error in the formula for l opt. The first figure must be 2884 and not 2834 and then the result is 30331.9.
I also found out that the Erasmus University cannot, at so short notice, invite you to stay longer. Therefore I want to invite you (and Mr. Zhang) for a second visit to my home, to show you all my calculations.
There is an additional error in my paper: after correction of equation (3) it yields z2 = 0.95 and not 0.60. The full set of calculations gives the following results:
But equation (3) must be: 1.0078^100 (y1 + a2 z2 / a1) = y2 - z2
p.t.o.
Aid percentage: 0 0.35 0.7 2.0 8 21 40 60
Duration of dev. process (years): 538 511 488 416 400 300 200 100
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extracted text
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TELEFOON 070 - 364 46 30
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Prof. J. TINBERGEN
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HAVIKLAAN 31
TELEFOON 070 - 364 46 30
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'T» / <^^'- e ^ '^^ê^'^ i^,j^
Prof. J. TINBERGEN
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HAVIKLAAN 31
TELEFOON 070 - 364 46 30
> , , . , , , , 2 ^ s ^ .>,., , , ^ ^ ^ , , _ , , ^^,^ ,^^ ,^^^^^^ ^.^
fo ,-ny Ac«ie , io
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60
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'T» / <^^'- e ^ '^^ê^'^ i^,j^
Prof. J. TINBERGEN
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2566 XD DEN HAAG, . S C J ^ L A S .
HAVIKLAAN 31
TELEFOON 070 - 364 46 30
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fo ,-ny Ac«ie , io
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^^^^^^
iSï.'uu
-/
to
60
