To what extent does public service motivation (PSM) affect how monetary rewards and promotion opportunities motivate government officials? This study offers an answer to this question through a survey experiment conducted with a sample of city government officials in Florida. The experimental results demonstrate that both monetary and promotion reward treatments positively motivate officials with low PSM. However, as the level of PSM increases, the positive treatment effect of the monetary reward decreases and converges on 0. Conversely, the positive effect of the promotion opportunity treatment not only decreases but becomes negative, indicating that PSM crowding out is taking place.

公共服务动机 (PSM) 在多大程度上影响金钱奖励和晋升机会如何激励政府官员？本研究通过以佛罗里达州市政府官员为样本进行的一项调查实验为这个问题提供了答案。实验结果表明，金钱和晋升奖励处理都积极地激励了低 PSM 的官员。但是，随着PSM级别的增加，货币奖励的正面处理效果降低并收敛于0。反之，晋升机会处理的正面效果不仅降低反而变为负面，说明PSM正在发生挤出。