I came accross an interesting passage in the Spanish version of Karl 
Kuehne''s book "Economics and Marxism". (The passage is not in the 
English version.)
Kuehne writes:
"We have already said that the analysis of economic growth cannot 
be carried out by means of the value calculation [i.e. social labor-
time calculation]. In order to understand growth in these terms, we 
should "correct" [Marx''s] concept of value. Recently, this approach 
has been held also by important Marxist economists as Lange in Poland, 
and Banfi in Italy.
"However, it is worth to mention a recent study by Zinn, who defends 
the opposite conception. According to Zinn, in a growing economy, 
outputs are normally greater than inputs, i.e. production is greater 
than costs. This fact could be understood only by means of the labor- 
value theory. Production and costs could be reckoned only in three 
ways: a) physical calculation, rejected by Zinn because goods are 
heterogeneous; b) monetary calculation, also invalidated by 
inflationary processes and c) labor-time calculation."
[My free "translation" from the Spanish version, Economia y Marxismo, 
Vol 3, p. 27, Barcelona, 1979; German original published in 1973.]
It is interesting to note that the now fashionable idea that Marx''s 
value theory has not dynamic meaning, was already "floating" in the 
late 60s. Banfi''s article mentioned by Kuehne was published in 
German! in 1967.
In the English version of Kuehne''s book (which Alejandro Valle-Baeza
recently sent me; thanks Alejandro!), the author refers to 3 works by 
Zinn:
1. Zinn K.G. [1970], Konsum und Krise bei Marx, Jahrbuch fuer 
Sozialwissenschaft, XXI, No 3.
2. Zinn K.G. [1972], Arbeitswerttheorie, Berlin.
3. Zinn K.G. and Rehberg, K.S. [1977], Marx''s Theory of Value as a 
Basic Concept of Interdependence Structures of Distribution in 
Capitalist Societes (English title), Jahrbuecher fuer Nationaloeko-
nomie und Statistik, CXCI (sic), No, 5-6.
Has someone ever heard about these works? Maybe Juriaan, who is in 
the German area.
                                            Alejandro Ramos