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If the other fellow sells cheaper than you, it is called dumping. 'Course, if you sell cheaper than him, that's mass production.

Will Rogers, Bryan B. Sterling (1995). “Will Rogers Speaks: Over 1,000 Timeless Quotations for Public Speakers (writers, Politicians, Comedians, Browsers ...)”, M Evans & Company
If the other fellow sells cheaper than you, it is called dumping. 'Course, if you sell cheaper than him, that's mass production.