ABSTRACT
The first sign of Potron’s renewed interest in economics came in 1935, when he published his note ‘Sur certaines conditions de l’équilibre économique. Lettre de M. Potron (90) à R. Gibrat (22)’ (Centre Polytechnicien d’Etudes Economiques. X-Crise. Bulletin Mensuel, 1935, Nos. 24–25: 62–5). It was a reaction to comments by Robert Gibrat on the talk ‘Le contenu economique des plans et le planisme’ given by Jacques Branger on 22 February 1935, both of which were published in a previous issue of the journal (Centre Polytechnicien d’Ètudes Èconomiques. X-Crise. Bulletin Mensuel, 1935, Nos. 20–21: 5–13, 14–15). Potron saw similarities between a matrix used by Ragnar Frisch in his articles ‘Circulation planning: Proposal for a national organization of a commodity and service exchange’ and ‘Circulation planning: Part III. Mathematical appendix’ (Econometrica, 1934, 2: 258–336; 422–35) referred to by Gibrat and the matrices which he himself had used in his economic publications more than 20 years before.
