There is an abstract rationale of all conduct which is rational at alt, and a rationale of all social relations arising through the organization of rational activity.
Source: "The limitations of scientific method in economics", 1924, p. 127 (2009 edition)
“In spite of all the foregoing, there is a science of economics, a true, and even exact, science, which reaches laws as universal as those of mathematics and mechanics. The greatest need for the development of economics as a growing body of thought and practice is an adequate appreciation of the meaning, and the limitations, of this body of accurate premises and rigorously established conclusions. It comes about in the same general way as all science, except perhaps in a higher degree, i. e., through abstraction. There are no laws regarding the content of economic behavior, but there are laws universally valid as to its form. There is an abstract rationale of all conduct which is rational at alt, and a rationale of all social relations arising through the organization of rational activity.”
Source: "The limitations of scientific method in economics", 1924, p. 127 (2009 edition)
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Frank Knight 13
American economist 1885–1972Related quotes

“It is clear that economics, if it is to be a science at all, must be a mathematical science.”
Source: The Theory of Political Economy (1871), Chapter I, Introduction, p. 38.

“Economics is not an exact science.”
Source: The Age of Uncertainty (1977), Chapter 1, p. 36
Source: The Economic Organization, 1951, p. 4 as cited in: Ross B. Emmett (ed). The Elgar Companion to The Chicago School of Economics http://books.google.com/books?id=MaCciKWcDIAC&pg=PA54, 2008. p. 53

George Boole, " Solution of a Question in the Theory of Probabilities http://books.google.nl/books?id=9xtDAQAAIAAJ&pg=PA32" (30 November 1853) published in The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science (January 1854), p. 32
1850s
Variant: Mayor aims of general theory:
(1) There is a general tendency toward integration in the various sciences, natural and social.
(2) Such integration seems to be centered in a general theory of systems.
(3) Such theory may be an important means for aiming at exact theory in the nonphysical fields of science.
(4) Developing unifying principles running "vertically" through the universe of the individual sciences, this theory brings us nearer the goal of the unity of science.
(5) This can lead to a much-needed integration in scientific education.
Source: 1950s, "General systems theory," 1956, p. 38, cited in: Alexander Laszlo and Stanley Krippner (1992) " Systems Theories: Their Origins, Foundations, and Development http://archive.syntonyquest.org/elcTree/resourcesPDFs/SystemsTheory.pdf" In: J.S. Jordan (Ed.), Systems Theories and A Priori Aspects of Perception. Amsterdam: Elsevier Science, 1998. Ch. 3, pp. 47-74.

The Notebooks of Leonardo da Vinci (1883), I Prolegomena and General Introduction to the Book on Painting

François Quesnay in letter to Mirabeau (Archives Nationales, Ms. 779, 4 bis, p.2 note); as cited in: Richard Van Den Berg and Albert Steenge. "Tableaux and Systèmes. Early French Contributions to Linear Production Models." Cahiers d'économie Politique/Papers in Political Economy 2 (2016): 11-30.
Kenneth Boulding (1961). "Contemporary economic research: . In Donald P. Ray (Ed.) Trends in social science. p..19 cited in: Erik Angner & George Loewenstein (2006) Behavioral Economics http://www.cmu.edu/dietrich/sds/docs/loewenstein/BehavioralEconomics.pdf
1960s