“Unlike what neo-liberals say, market and democracy clash at a fundamental level. Democracy runs on the principle of 'one man (one person), one vote'. The market runs on the principle of 'one dollar, one vote'.”
Source: Bad Samaritans: The Myth of Free Trade and the Secret History of Capitalism (2008), Ch. 8, Democracy and the free market, p. 172
Context: Unlike what neo-liberals say, market and democracy clash at a fundamental level. Democracy runs on the principle of 'one man (one person), one vote'. The market runs on the principle of 'one dollar, one vote'. Naturally, the former gives equal weight to each person, regardless of the money she/he has. The latter give greater weight to richer people. Therefore, democratic decisions usually subvert the logic of market.
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Ha-Joon Chang 44
Economist 1963Related quotes

“Democracy is acceptable to neo-liberals only in so far as it does not contradict the free market.”
Source: Bad Samaritans: The Myth of Free Trade and the Secret History of Capitalism (2008), Ch. 8, Democracy and the free market, p. 176

Quoted and attributed to Graham in Warren Buffett's 1993 letter to investors. https://www.berkshirehathaway.com/letters/1993.html
The statement is not found in any of Graham's publications or lecture transcripts, and when asked, Buffett could not provide a reference. https://www.bogleheads.org/forum/viewtopic.php?t=77840
Disputed
Introduction: Thinking about Politics.
On Politics: A History of Political Thought: From Herodotus to the Present (2012)
“One person, one vote is the great equalizer of humanity.”
at LCV Annual Gala https://www.lcv.org/article_category/blog/Speech

"Interview: President Kim Dae Jung" in TIME Asia http://www.cnn.com/ASIANOW/time/magazine/99/0913/interview.html (13 September 1999)