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Non-monetary sales incentives specifically
A more general but similar question was recently asked and whitney.g provided a thorough answer with some article links that explore the impact of workplace incentive programs in depth (see the answer link below). The articles basically explain that most of the common incentive systems (whether monetary or non-monetary) fail to produce much measurable impact and that motivating performance is far more effective when systems are designed to enable employees to experience progress and achievement in their work assignments.