Membership fees refer to the regular payments that individuals or organizations must make in order to be a part of a particular group, organization, or club. These fees often help cover the costs of running the organization, providing services or benefits to members, and supporting the group's mission or goals. Membership fees can vary widely depending on the type of organization and the level of benefits provided to members. This research area may explore trends in membership fees across different types of organizations, the impact of fees on member retention and recruitment, and best practices for setting and adjusting membership fees.