### „Hayek never really departed from the essential economic theory that he developed during the 1920s, although he expanded and deepened his analysis.“

— Alan O. Ebenstein American political scientist, educator and author 1959

— Tjalling Koopmans, Paul Samuelson, Tjalling Koopmans, and Richard Stone. "Report of the evaluative committee for Econometrica." Econometrica- journal of the Econometric Society. (1954): 141-146.

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— Alan O. Ebenstein American political scientist, educator and author 1959

— Pitirim Sorokin American sociologist 1889 - 1968

Pitirim Sorokin (1937) Social and Cultural Dynamics http://books.google.nl/books?id=fbZyka2W_1cC. p. 283

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— Terry Eagleton British writer, academic and educator 1943

Conclusion: political Criticism, p. 172

— Kenneth E. Boulding British-American economist 1910 - 1993

p. xv

— Gregory Bateson English anthropologist, social scientist, linguist, visual anthropologist, semiotician and cyberneticist 1904 - 1980

Gregory Bateson, Don D. Jackson, Jay Haley, and John Weakland (1956) " Towards a theory of Schizophrenia http://www.psychodyssey.net/wp-content/uploads/2012/05/TOWARD-A-THEORY-OF-SCHIZOPHRENIA-2.pdf" In: Behavioral Science (1956) Vol 1, nr.4, pp.251-254

— Kenneth E. Boulding British-American economist 1910 - 1993

p. 19

— Robert Aumann Israeli-American mathematician 1930

p. 3

— Michel Bréal French philologist 1832 - 1915

p. 11

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— J. R. Partington British chemist 1886 - 1965

Introduction

— Benjamin Peirce American mathematician 1809 - 1880

Context: All relations are either qualitative or quantitative. Qualitative relations can be considered by themselves without regard to quantity. The algebra of such enquiries may be called logical algebra, of which a fine example is given by Boole.
Quantitative relations may also be considered by themselves without regard to quality. They belong to arithmetic, and the corresponding algebra is the common or arithmetical algebra.
In all other algebras both relations must be combined, and the algebra must conform to the character of the relations.
§ 3.

— Fred Emery Australian psychologist 1925 - 1997

p. 21.

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— Thaddus E. Weckowicz Canadian psychologist 1919 - 2000

p. 102-103

— Hendrik Casimir Dutch physicist 1909 - 2000

in his memoirs, as quoted by

Many - perhaps most - of the great issues of science are qualitative, not quantitative, even in physics and chemistry. Equations and measurements are useful when and only when they are related to proof; but proof or disproof comes first and is in fact strongest when it is absolutely convincing without any quantitative measurement.

Or to say it another way, you can catch phenomena in a logical box or in a mathematical box. The logical box is coarse but strong. The mathematical box is fine-grained but flimsy. The mathematical box is a beautiful way of wrapping up a problem, but it will not hold the phenomena unless they have been caught in a logical box to begin with.“

— John R. Platt American physicist 1918 - 1992

John R. Platt (1964) " Science, Strong Inference -- Proper Scientific Method (The New Baconians) http://256.com/gray/docs/strong_inference.html. In: Science Magazine 16 October 1964, Volume 146, Number 3642. Cited in: Gerald Weinberg (1975) Introduction to General Systems Thinking. p. 1, and in multiple other sources.

— Wassily Leontief Russian economist 1905 - 1999

p. 33, as cited in: Drejer, Ina. " The Role of Technological Linkages in a Leontief Scheme-From Static Structures to Endogenous Evolution of Technical Coefficients http://www.druid.dk/uploads/tx_picturedb/dw1999-340.pdf." Preparado para: DRUID Winter Conference, Holte (enero 1999). 1998.