“The natural price, therefore, is, as it were, the central price, to which the prices of all commodities are continually gravitating.”
Source: (1776), Book I, Chapter VII, p. 69.
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Adam Smith 175
Scottish moral philosopher and political economist 1723–1790Related quotes

(1847)

Source: The Principles of Political Economy and Taxation (1821) (Third Edition), Chapter V, On Wages, p. 52

Im Reiche der Zwecke hat alles entweder einen Preis oder eine Würde. Was einen Preis hat, an dessen Stelle kann auch etwas anderes als Äquivalent gesetzt werden; was dagegen über allen Preis erhaben ist, mithin kein Äquivalent verstattet, das hat eine Würde.
434:32, M. Gregor, trans. (Cambridge: 1998), p. 42
Groundwork of the Metaphysics of Morals (1785)

Des Moines Iowa speech (1 February 1916) http://www.combat.ws/S3/BAKISSUE/CMBT01N2/SMOKE.HTM, on "The Westerm Preparedness Tour" http://www.allthingswilliam.com/presidents/wilson.html
1910s
Source: The transformation of corporate control, 1993, p. 117

“Continuous reading is the price that each author must pay.”

Source: The balance of payments, 1951, p. 160; As cited in: Metaxas & Weber (2013, p. 22)