Contingent pay could either increase or decrease employees’ motivation. It is an oversimplified and often wrong idea about money being a motivator only. Often rewards could even do harm. Whether or not money motivates heavily depends on the nature of the task.
You'll find all slides here: https://armintrost.de/en/professor/digital/human-resources-strategies/
#32 Does Pay for Performance really motivate? | Human Resources Strategies podcast - Listen or read transcript on Metacast