“It is important, therefore, to understand at the outset the simplicity of this book - what it can accomplish and what it cannot. What it does try to do is to isolate certain psychological factors and to demonstrate rigorously by quantitative scientific methods that these factors are generally important in economic development.”
Source: The Archiving Society, 1961, p. ix
Help us to complete the source, original and additional information
David C. McClelland 16
American psychological theorist 1917–1998Related quotes

Accordingly, the quantitative study of economic phenomena here considered may be termed econometrics.
Frisch (1927) as quoted in Divisia 1953, pp.24-25; Cited in: Bjerkholt, Olav. " Ragnar Frisch and the foundation of the Econometric Society and Econometrica http://www.ssb.no/a/histstat/doc/doc_199509.pdf." ECONOMETRIC SOCIETY MONOGRAPHS 31 (1998): 26-57.
Lead paragraph of a memorandum on the importance of establishing the journal "Oekonometrika"
1920
General System Theory (1968), 4. Advances in General Systems Theory
Source: 1950s, The Skills of the Economist, 1958, p. 19

On Protracted Warfare (1938)
Context: Weapons are an important factor in war, but not the decisive factor; it is people, not things that are decisive. The contest of strength is not only a contest of military and economic power, but also a contest of human power and morale. People necessarily wield military and economic power.

1930s, On Protracted Warfare (1938)
Source: An Interview with Douglas T. Ross (1989), p. 25.

Quoted in Mathrubhumi https://english.mathrubhumi.com/mobile/news/kerala/collector-divya-s-iyer-envisions-a-women-friendly-pathanamthitta-women-empowerment-pathanamthitta-divya-s-iyer-1.5877873

“What is important is not just what you do - "I am writing a book"”
but how you do it, how you approach it, and what you come to value.
[…] There are many realities. We should remember this when we get too caught in being concerned about the way the rest of the world lives or how we think they live.
Essay, "Every Monday". p.127
Writing Down the Bones (1986)
Hayek's Journey: The Mind of Friedrich Hayek (2003)