Final answer:
The source of organizational power based on the ability to control pay, promotions, and work assignments is referred to as reward power.
Step-by-step explanation:
The source of power in an organization based on a person's ability to decide pay, promotions, scheduling, and work assignments is reward power. This type of authority comes from the control of resources and benefits that others want and can be distributed to incentivize or motivate certain behaviors or performances. Reward power is often juxtaposed with coercive power, which is based on the ability to inflict sanctions or punishment. Both types of power can influence behavior, but they operate through different mechanisms. Unlike coercive power, reward power is generally viewed positively as it offers inducements rather than threats to shape others' actions.