When casey was promoted to head librarian of a small branch library, she really enjoyed the autonomy she had to hire employees, determine programming, and stock books that would best serve the local community?

The instance given above is an example of AN INTRINSIC REWARD.
There are two types  of reward, intrinsic and extrinsic reward. An intrinsic reward is a type of reward which is personally gained when one achieves a personally set goal. An intrinsic reward is personal to the person who is engaged in a particular activity. For instance, in the scenario given above, the intrinsic reward is the satisfaction and the fulfillment which Casey feels. An extrinsic reward is a type of reward that is given to one by an higher authority as a result of good performance.