Thank you for the opportunity to help you with your question!
part time job are done mainly after classes by students or people engaged in other activities that cannot allow them to be full-time workers.
some of these part time jobs do have benefits for their workers .the benefits depend with the company they may not be same in all companies,some of these benefits are,medical coverage , retirement and profit sharing.these benefits also depend with the number of hours an employee is working for a company per week.
my opinion is,by giving incentives and benefits to workers helps to motivate them and make them more competent in their work.
Please let me know if you need any clarification. I'm always happy to answer your questions.