“It is my hope that in such a way we may again, as Marx claimed, find scientific arguments in the competition between various systems, but up-to-date scientific arguments rather than obsolete ones. This more fundamental research in economics deserves relatively more attention and resources than the more superficial versions of economic research directed at forecasting or analysing very short-term fluctuations in market prices, on which quite some money is being spent to-day.”
"The Use of Models: Experience," 1969
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Jan Tinbergen 21
Dutch economist 1903–1994Related quotes

Source: The rise of the western world, 1973, p. vii, Preface

Ackoff (1959), "Games, Decisions and Organizations," General Systems, 4 (1959), p. 145-150; cited in: Ludwig von Bertalanffy (1968) General System Theory. p. 9.
1950s
Source: "The limitations of scientific method in economics", 1924, p. 97 (2009 edition); Lead paragraph

“The worst thing happens when ideologists are trying to analyse scientific researches.”
Vetulani, Jerzy (2008): Neurobiologia inteligencji. Wiedza i Życie, 2, pp. 14–19 (in Polish).

[Why Is Gravity So Elusive? Frank Wilczek, Erik Verlinde, Laura Mersini-Houghton, 4 December 2017, YouTube, https://www.youtube.com/watch?v=7lui9qZ6cDs] 11:20 of 40:44
Source: Sociology and modern systems theory (1967), p. vii as cited in: cited in: Ludwig von Bertalanffy (1968) General System Theory. p. 7-8.