Eventually it seems that the story about this reference runs as follows: Hayek, von Mises and Bohm Bawerk were translated into Spanish by two brothers - Joaquin and Luis Reig Albiol. Joaquin translated inter alia Human Action and develops in a footnote the influence, alledged by Mises of marginalism on the non publication of Capital (after 1867) (The book is intitled in Spanish Accion Humana and went through three edition (1960, 1968, 1980). A translation of the part XII of the first volume of Bohm Bawerk Geschichte und Kritik der Kapitalzinstheorien. was later published with the title La teoria de la explotacion [Madrid] : Mirasierra, etc. , [1976]. The preface is signed "J.R." - obviously Joaquin Reig Albiol. The conclusion of this preface is essentially the same as in the footnote of the Accion Umana. Joaquin Reig explainedthat Marx was a prolific author in economics till 1867 and then added : "Many people think that his silence after is due to the publications in 1871 by Jevons (Theory of political economy) and Menger (Principles of Political economy)" (p.33). Summung up, Mises and/or Reig Albiol supplied no evidence about any link between Jevons or Menger Marx. In the "Fatal Conceit" Hayek obviously quoted Joaquin Reig who has developped some elliptic sentences of Mises. End of the story unless Luis Joaquin Reig has developped the connection between his brothers Reig, Hayek and von Mises. (Thanks to Teresa Garcia Merino for her help.) PS : The elaboration of Volume III is finely analyzed in the International journal of political economy Spring 2002 Vol. 32 No. 01 (Guest Editors: Regina Roth & Fred Moseley) Alain Alcouffe