“The price system works so well, so efficiently, that we are not aware of it most of the time. We never realize how well it functions until it is prevented from functioning, and even then we seldom recognize the source of the trouble.”
Source: Free to Choose (1980), Ch. 1 "The Power of the Market", p. 14
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Milton Friedman 158
American economist, statistician, and writer 1912–2006Related quotes

“Intelligence is a measure of how well you function within your level of awareness.”
Source: God's Debris: A Thought Experiment

Black Lives Matter Was Always Designed to Be a Global Movement, Vice] (7 July 2020)
[Haggard, Ted, Simple Prayers for a Powerful Life, Regal Books, September 2002, p. 110, ISBN 0830730559]
Introduction, Why Study Economics?, p. 1
Economics For Everyone (2008)

Mazurek, Maria (7 July 2017): Cudowna armia, która broni naszego ciała http://plus.gazetakrakowska.pl/magazyn/a/cudowna-armia-ktora-broni-naszego-ciala,12271571. Gazeta Krakowska (in Polish), pp. 18–19.

1970's, Every Man an Artist: Talks at Documenta 5', 1972

For one swallow does not make a summer, nor does one day; and so too one day, or a short time, does not make a man blessed and happy.
Book I, 1098a; §7 as translated by W. D. Ross
Variants:
One swallow does not a summer make.
As quoted in A History of Ancient Philosophy: From the Beginning to Augustine (1998) by Karsten Friis Johansen, p. 382
One swallow (they say) no Sommer doth make.
John Davies, in The Scourge of Folly (1611)
One swallow yet did never summer make.
As rendered by William Painter in Chaucer Newly Painted (1623)
One swallow does not make a spring, nor does one sunny day; similarly, one day or a short time does not make a man blessed and happy.
As translated in Philosophical Grounds of Rationality: Intentions, Categories, Ends (1988), by Richard E. Grandy and Richard Warner, p. 483
Nicomachean Ethics
Source: Systems Engineering Tools, (1965), p. 8; Cited in: Peter Allen, Steve Maguire, Bill McKelvey (2011) The SAGE Handbook of Complexity and Management. p. 35