Source: The Evolution of Civilizations (1961) (Second Edition 1979), Chapter 5, Historical Change in Civilizations, p. 137
“Politeness and civility are the best capital ever invested in business.”
Ch. 17: "Be polite and kind to your customers" http://www.fourmilab.ch/etexts/www/barnum/moneygetting/moneygetting_chap18.html
Art of Money Getting (1880)
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P.T. Barnum 17
American showman and businessman 1810–1891Related quotes

"Thoughts of Eric Hoffer, Including: 'Absolute Faith Corrupts Absolutely'", The New York Times Magazine (April 25, 1971), p. 50.

Source: The Monk Who Sold His Ferrari: A Fable About Fulfilling Your Dreams Reaching Your Destiny

Source: The Limits To Capital (2006 VERSO Edition), Chapter 9, Money, Credit And Finance, p. 269

“The most valuable of all capital is that invested in human beings;”
Source: Principles of Economics, (1890), p. 468 (9th ed. 2009).
Context: If we compare one country of the civilized world with another, or one part of England with another, or one trade in England with another, we find that the degradation of the working-classes varies almost uniformly with the amount of rough work done by women. The most valuable of all capital is that invested in human beings; and of that capital the most precious part is the result of the care and influence of the mother, so long as she retains her tender and unselfish instincts, and has not been hardened by the strain and stress of unfeminine work.
newspaper on Sep.27th, 1963, to oppose Quebec's pension investment fund (RRQ+CDPQ). Her government ended up setting up exactly that type of fund shortly after (CPP+CPPIB).
Source: https://books.google.ca/books?id=fn0NgNxTAxIC&pg=PT223&lpg=PT223
Source: http://ici.radio-canada.ca/emissions/tout_le_monde_en_parlait/2009/reportage.asp?idDoc=86807

"The Organization of Labor," http://ebooks.library.cornell.edu/cgi/t/text/pageviewer-idx?c=nora;cc=nora;g=moagrp;xc=1;q1=The%20Organization%20of%20Labor;rgn=full%20text;cite1=Powderly;cite1restrict=author;view=image;seq=0122;idno=nora0135-2;node=nora0135-2%3A2 North American Review, vol. 135, no. 2, whole no. 309 (Aug. 1882), pp. 118–9.
“Marriage was the best business deal I ever made. After that, Jesus of Nazareth and The Muppets.”
Raymond Snoddy Grade's CRR battle plan defies logic" http://www.campaignlive.co.uk/opinion/643554/Raymond-Snoddy-media-Grades-CRR-battle-plan-defies-logic/?HAYILC=RELATED, Campaign, 14 March 2007

Source: New Options for America (1991), Chapter 8, "Rebuilding America – the Old-Fashioned Way," p. 57.

Source: Nearing Home: Life, Faith, and Finishing Well