A reward,such as a T-shirt for completing a fun-run,is an example of a possessional reinforcer.

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In this case, the T-shirt serves as a tangible reward for the behavior of completing the fun-run. It is something that the participants can take possession of, and it acts as a symbol of their accomplishment. The T-shirt can motivate participants to complete the run in order to receive the item, and it can also serve as a reminder of their achievement, potentially reinforcing the behavior of participating in similar events in the future.
Possessional reinforcers are often used in various settings, including educational and fitness contexts, to encourage and maintain desired behaviors by providing a physical reward that has value to the recipient.

A Reward,such as a T-Shirt for Completing a Fun-Run,is an Example