“In general, corruption tends to exist whenever governments have favors to extend, or something to sell.”
Source: 2000s, The Age of Turbulence (2008), Chapter Thirteen, "The Modes of Capitalism", p. 275.
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Alan Greenspan 51
13th Chairman of the Federal Reserve in the United States 1926Related quotes

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“Among a people generally corrupt, liberty cannot long exist.”

“Power tends to corrupt and absolute power corrupts absolutely.”
Letter http://oll.libertyfund.org/index.php?option=com_content&task=view&id=1407&Itemid=283 to Mandell Creighton (5 April 1887), published in Historical Essays and Studies, by John Emerich Edward Dalberg-Acton (1907), edited by John Neville Figgis and Reginald Vere Laurence, Appendix, p. 504; also in Essays on Freedom and Power (1972)
Paraphrased variant: All power tends to corrupt and absolute power corrupts absolutely.
Context: I cannot accept your canon that we are to judge Pope and King unlike other men, with a favorable presumption that they did no wrong. If there is any presumption it is the other way against holders of power, increasing as the power increases. Historic responsibility has to make up for the want of legal responsibility. Power tends to corrupt and absolute power corrupts absolutely. Great men are almost always bad men, even when they exercise influence and not authority: still more when you superadd the tendency or the certainty of corruption by authority. There is no worse heresy than that the office sanctifies the holder of it. That is the point at which the negation of Catholicism and the negation of Liberalism meet and keep high festival, and the end learns to justify the means.

"The Progressive Covenant With The People" http://memory.loc.gov/cgi-bin/query/r?ammem/papr:@filreq(@field(NUMBER+@band(trrs+1146))+@field(COLLID+roosevelt)) speech (August 1912)
1910s
Context: Political parties exist to secure responsible government and to execute the will of the people. From these great tasks both of the old parties have turned aside. Instead of instruments to promote the general welfare they have become the tools of corrupt interests, which use them impartially to serve their selfish purposes. Behind the ostensible government sits enthroned an invisible government owing no allegiance and acknowledging no responsibility to the people. To destroy this invisible government, to dissolve the unholy alliance between corrupt business and corrupt politics, is the first task of the statesmanship of the day.
“Fun without sell gets nowhere, but sell without fun tends to become obnoxious.”
Communications of an Advertising Man (1961)
Methods of Mathematics Applied to Calculus, Probability, and Statistics (1985)