"Well, there is a contradiction in a sense. If you're making commercials which sell products which are unhealthy or which are unnecessary, I think that you are part of a system - I am part of a system which encourages people to buy things and do things which are not to their best interest. And to that extent you could say it was contradictory."
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Source : "Remembering Oscar-Winning Cinematographer Haskell Wexler". "Fresh Air" with Terry Gross, www.npr.org. December 29, 201.