“Consideration of a further possibility, namely that of constructing physical systems that are analogues of the economic system, and of observing and recording their behaviour.”
Source: The Mechanism of Economic Systems (1953), p. vi
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Arnold Tustin 18
British engineer 1899–1994Related quotes

“The observing mind is not a physical system, it cannot interact with any physical system.”
Nature and the Greeks (1954)
Context: The observing mind is not a physical system, it cannot interact with any physical system. And it might be better to reserve the term "subject" for the observing mind. … For the subject, if anything, is the thing that senses and thinks. Sensations and thoughts do not belong to the "world of energy."
“Further, economic systems … have never arranged themselves by themselves.”
Atheism Questions and Answers
Context: Further, economic systems … have never arranged themselves by themselves. It is men who do the ordering according to their attitudes, desires and understanding of things. Changes take place, not independent of man's will, but on account of man's wills. Civilization has progressed by man's interference with material conditions.
Source: Definition of System, 1956, p. 20 cited in: Baleshwar Thaku eds. (2003) Perspectives in resource management in developing countries. p. 54

Michael Halliday (2005, p. 68) as cited in: Andrew Halliday and Marion Glaser (2011) "A Management Perspective on Social Ecological Systems". In: Human Ecology Review, Vol. 18, No. 1, 2011.
1970s and later
1950s, General Systems Theory - The Skeleton of Science, 1956

Francis Heylighen, 1990, "Classical and non-classical representations in physics I." Cybernetics and Systems 21. p. 423; As cited by: Hieronymi, A. (2013), Understanding Systems Science: A Visual and Integrative Approach. Syst. Res.. doi: 10.1002/sres.2215
Part 1, Chapter 3, Economic History, p. 43
Economics For Everyone (2008)

1962, Second Letter to Nikita Khrushchev