law of diminishing returns
Definition:
As increments of a variable factor are added to or combined with a fixed factor then, beyond a certain point the returns on the variable factor will decline or diminish.
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© Westburn Publishers Ltd 2002, The Westburn Dictionary of Marketing edited by Michael J Baker, ISBN 978-0-946433-01-8. www.themarketingdictionary.com. Entry: [Michael J. Baker],.