FOLIO I · THINKER · GEN. 03 · N° 034

Leo Illy

Works
2
Articles
1
Generation
3.
Portrait of Leo Illy
FOL. 03 · N° 034 · Leo Illy
BIOGRAPHY

Life and Work

Leo Illy (Schönfeld), who originally went by the name Schönfeld, was a regular participant in Mises's private seminar. An auditor by profession, after the First World War he published several contributions to economics as well as the monograph Grenznutzen und Wirtschaftsrechnung (1924; Marginal Utility and Economic Calculation), with which he sought to revive the dormant discussion of marginal utility theory. After the Anschluss he remained in Austria and, after the war, obtained his habilitation at the Universität für Bodenkultur (University of Natural Resources), then at the Hochschule für Welthandel (College of World Trade), and finally at the University of Vienna under Hans Mayer. His 1948 textbook Das Gesetz des Grenznutzens (The Law of Marginal Utility) served as an easily understandable summary of marginal utility theory.
Metadata
Born
28. Oktober 1888
in Wien
Died
17. Dezember 1952
Generation
Generation 3
Life stations

Stations

  1. 1888
    1888
    Birth · Wien
    Birth

    Born on 28 October 1888 in Vienna. Originally named Schönfeld.

  2. 1918
    1918
    Career · Wien
    Auditor of Books and Accounts— approximate

    By profession an auditor of books and accounts; a regular participant in the Mises private seminar; after the First World War he published contributions on economics.

  3. ⁦1920–1934⁩
    ⁦1920–1934⁩
    Conference · Wien
    Mises Private Seminar— approximate

    A regular participant in Ludwig von Mises's private seminar in Vienna during the 1920s and early 1930s.

  4. 1924
    1924
    Publication · Wien
    <em>Grenznutzen und Wirtschaftsrechnung</em> (Marginal Utility and Economic Calculation)

    Publication of the monograph <em>Grenznutzen und Wirtschaftsrechnung</em>, with which Illy sought to revive the dormant discussion of marginal utility theory.

  5. 1938
    1938
    Other · Wien
    Name Change from Schönfeld to Illy

    Name change from Leo Schönfeld to Leo Illy, forced under National Socialist pressure in 1938.[1]

  6. 1945
    1945
    Habilitation · Wien
    Habilitation at the Universität für Bodenkultur (University of Natural Resources and Life Sciences)— inferred

    Completed his Habilitation after the war at the Universität für Bodenkultur (University of Natural Resources and Life Sciences) in Vienna.

  7. 1948
    1948
    Publication · Wien
    “Das Gesetz des Grenznutzens” (The Law of Marginal Utility)

    Publication of the textbook “Das Gesetz des Grenznutzens” (The Law of Marginal Utility), an easily accessible summary of marginal utility theory.

  8. 1948
    1948
    Habilitation · Wien
    Habilitation at the Hochschule für Welthandel— inferred

    A further Habilitation at the Hochschule für Welthandel in Vienna.

  9. 1949
    1949
    Publication · Wien
    “Grundprobleme der Preistheorie” (Fundamental Problems of Price Theory)

    The contribution “Grundprobleme der Preistheorie” (Fundamental Problems of Price Theory) in 1949.[2]

  10. 1950
    1950
    Habilitation · Wien
    Habilitation at the University of Vienna under Hans Mayer— inferred

    Eventually completed his Habilitation at the University of Vienna under Hans Mayer.

  11. 1952
    1952
    Death · Wien
    Death

    Died on 17 December 1952 in Vienna (given as "ibidem" in the biographical text).[3]

Relationships

Influences

Influenced by · 1
  1. 1950
    1950
    Habilitation supervisor

    Eventually completed his Habilitation at the University of Vienna under Hans Mayer.[3]

Private seminar, colleagues, Mont Pèlerin · 1
  1. ⁦1920–1934⁩
    ⁦1920–1934⁩
    Private seminar

    Permanent participant in Ludwig von Mises' Privatseminar in Vienna during the 1920s and early 1930s.

Leo Illy in the context of the School as a whole: five generations, their teacher-student lineages, circles and collegial ties.

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SOURCES ON STATIONS AND RELATIONSHIPS5 citations · 3 sources
Buch (Sekundärliteratur)· 2
  • [1]Kauder 1965: A History of Marginal Utility Theory, S. 73
  • [2]Schönfeld-Illy 1949: Grundprobleme der Preistheorie (Festschrift Hans Mayer)
Topography

Places of Activity

CATALOGUE OF WORKS · CHRONOLOGICAL

The Books

1920s
1924
36 yrs.
Grenznutzen und Wirtschaftsrechnung
Book
OriginalGerman
1940s
1948
60 yrs.
Das Gesetz des Grenznutzens. Untersuchungen über die Wirtschaftsrechnung des Konsumenten
Book
OriginalGerman
ARTICLES · 1 CATALOGUED

Essays, Reviews, Lectures

1940s
1949
61 yrs.
Grundprobleme der Preistheorie
Article
OriginalGerman
Cite this page

Three copy-ready formats with the canonical URL and access date.

APA
Leo Illy. (n.d.). Edited by mises.at and scholarium. Accessed July 19, 2026, from https://mises.at/en/denker/leo-illy
Chicago
“Leo Illy.” n.d. Edited by mises.at and scholarium. Accessed July 19, 2026. https://mises.at/en/denker/leo-illy.
German historical style
Leo Illy, edited by mises.at and scholarium, https://mises.at/en/denker/leo-illy (accessed July 19, 2026).