„Decisions and plans made by others... [can be judged to be] quantitatively at least as important as the primary uncertainty arising from random acts of nature and unpredictable changes in consumers' preferences.“

—  Tjalling Koopmans, p. 163; as cited in: Richard Langlois (1989) Economics as a Process. p. 181
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Tjalling Koopmans
1910 - 1985
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